Suggested

Increase max Prestige

you will have the same situation at 15000 like you have at 10000, would change nothing.

What I would like to see is to leave the ceiling at 10k but make it harder to get there and harder to stay there. It shouldn't be possible to get to or remain at 10k unless you are consistently winning Elite titles in competitive leagues.

Currently at the end of the season the top 2 teams in two car leagues and the top 4 in one car leagues receive 100 rep points. This means that anyone regularly finishing in these positions can achieve 10k without ever having won a championship which can't be right.

Then once they hit 10k a number of managers retire the team and stay there forever which is another reason there are so many 10k teams. (BTW I have an inactive 10k team)

My simple solution would be...
1. Remove the 100 rep for top 2 or 4 teams and replace with 50 1st, 20 2nd and 10 for 3rd. If this was still found to be too generous it would be easy for the devs to adjust the prizes.
2. By default filter out all teams who are not currently competing in a championship but provide a button to "View Inactives". This allows the people who have worked hard to achieve 10k to remain there but under normal circumstances they wouldn't clutter up the top 100 places in HoF.

Edit:
BTW, I don't want to set any wild expectations because I don't believe anything will happen in the immediate future, but I believe the HoF and rep points is on the to-do-list for the iGP development team. So this suggestion thread is quite timely.

This would definitely be a good idea. Better to show who is consistently at the top rather than 100 people who got to 10k in 2018/2017 then stopped. Those innactive should at least be racing to be in the hall of fame. Not really a hall of fame if those innactives can't be bothered to even race because they care too much about their rep!

I agree with Peter

i like the idea of switching between active and non active, to be able to differentiate.

on the other hand a Hall of Fame, is for past achievements, so the non actives should be tjere, too.
i think noone will Kick michael Schumacher from the Hall of Fame because he isn't racing anymore.

You're absolute right, noone will do that, but in reality there are no prestige points.

There are only races, wins, championships....
And from that sites in the HoF I would kick nobody, because 20 championships are 20 chamionchips.
Bute prestige points are point who changes every race, up and down, for everyone who's driving.

In my opinion its not fair to the active players, that they does not have the chance to be better than the inactive ones, just because the inactive teams did not drive anymore.

Maybe another solution is better to solve this: Teams who are inactive for more than 30 Days, lose 10 Points per day.

i get your point. in my view a hall of fame is more about historical achievements. 
what you are talking about is more like a world ranking. since titles are Not a lot worth because you can have Won them in weak leagues, which happens a lot, they are misleading Alone. a filter option would be great than you could combine a Hall of Fame with a world ranking.

All valid pov's.... Imo when the devs did their purged of inactive accounts, it should've resolve some of these issues. 

As for the HOF thing, I can't think of any sport that places active players in a  HOF. For that reason alone I would support a world ranking system composed of active players more so than the current "HOF".  There's no rep on being on that list at all... 

@Memo
Doesn't hiding the inactives also achieve what you want? With Inactives hidden it becomes a World Ranking of current active players but un-hiding inactives turns the same information into a HoF. Unless of course you want to use different criteria for ranking HoF but that opens up a whole new debate.

if your going to keep the ceiling at 10k and have some teams at 10k still afterwards, then why not put the 10k teams in order of how high average reputation the league your in is, even that has flaws but it would probably be better than it is now with the #1 being sorted in order of how new your account is / when you set it up etc.

My opinion is that it needs a revision, but there are many other things to be put as high priority (I won't give examples to not be off-topic)

I propose instead of making the HoF based on the current rp of the player, instead base it on the highest rp the player has ever achieved then, if you remove the ceiling and made it harder to gain rp as the rp of the player gets higher, this would stop players from deciding to stop racing with their teams once they reach a certain goal and instead keep racing and racing and racing because they can always reach a higher highscore without any fear of losing what they've earned in the past (this is why 90% of players become inactive). I believe this is the only solution to get people to log back into those 10k accounts and keep racing! After all, the goal of the HoF should be to be 1st, not equal 1st...

Additionally this would make more sense as a HoF, since people who are put in irl HoF's don't get removed once they get old or a little worse at their sport

How to make it harder to gain rp? Kevin's solution: 1. Remove the 100 rep for top 2 or 4 teams and replace with 50 1st, 20 2nd and 10 for 3rd. If this was still found to be too generous it would be easy for the devs to adjust the prizes.

Combine this with the inactive/active toggle that has been proposed and the HoF will suddenly become the most effective way to find the greatest players of the game.

That sounds much less time consuming(hiding inactives). But what's the point of keeping inactive deemed players in the database anyways!?   But yea, that would definitely shorten the hof list. Not to mention making it more relevant than what it currently is. 

If we talk about a purge, where inactive players will be deleted or else, then there are many more things you can or need to do.

I've seen many drivers, with high talent at low age in inactive teams. The contracts never expire, because they're not driving anymore. Here it should be fine, to release the drivers and put them on the TM, to reinclude them in the game.
But that ist just an example and there are some more things you can or must do, if you purge the database.
We should open an extra thread for that, because here we talk about the HoF.

I've read this whole thing the last days and I'm pleased about how many people are interessted in this.
I think that there are many ways who lead us to Rome.
First of all, we should separate HoF and world ranking.
The HoF is what we have and it is about historical archievements.
A world ranking is what many people want and is about current standings.
In my opinion, it whould be fine to combine these two things, to one ranking.
We can have a HoF for championships, wins, races etc.
And at the prestige site in the HoF we can have a world ranking, where the inactives been hidden or else.
In addition to that, the max prestige can be increased. I think that it would be a way harder to stay on 15k instead of 10k, because you gain less and lose more points in a race.

Wow!!! Talk about opening a can of worms here.... but it's all to help iGP evolved and move forward. 

Adding it up to 15,000 or even 20,000 is useless since it would be the same managers in the HoF in my opinion. I mean, granted I've hit everything but the pace car (Driver/Team Championships and Retirements) so far, I've been climbing up there little by little in the categories mentioned, but it's gonna take a WHOLE lot of time to get there.

Also, this is a very interesting topic in terms of trying to help evolve iGP Manager for the future.