I understand the F1 point system but I think it does not work on iGP. Why I think that? There are 5 main reasons:
1. Never DNS. There are no mechanical failures or touches between drivers here, the only way to be disqualified is to run out of fuel. So if you are disqualified F1 does not mean a big gap of points with those who have not been in the top 10, however if you fall far behind in an iGP race it will never be for disqualification, but because you deserve it or because You failed the strategy.
2. Too much regularity. Linked to the previous reason, since there are no disqualifications or mechanical failures, it is easy for the more developed teams to hoard all the points, making it more difficult for the teams of medium and low board to get points. This is unfair to those who are disputing the permanence in a category, since the most usual is that almost all there are 0 points and although one of those managers get better results in all races, if the other has his lucky day and reach of the top 10 will be saved from the descent.
3. More cars. In F1 they usually compete an average of 20 cars, in iGP with a full league can be up to 32, which means that there are always 12 more cars that do not score compared to F1, which is more than double, something illogical for iGP.
4. New managers. It is common for a manager to join the league already started, which means development of the car 0, this usually means that it will be almost impossible for that manager to score, something that could get if the range of points was higher. Compete throughout the season means more opportunities to get points, something these new managers do not have.
5. Extra motivation. Entering the top 10 can be a difficult goal, even impossible for many managers (in an active league), which makes it easy for those managers to get discouraged. It is not the same to fight for a position 15 without points than for a 15 position with points. The difference is that if you fight for points is reflected in the effort of the season, and that is much more satisfying.
So I think at least we should use a system like the one in MotoGP where they score 15 drivers but I definitely propose a system where they score 20 like this:
1. 35 | 6 difference with the next
2. 29 | 5 difference with the next
3. 24 | 4 difference with the next
4. 20 | 3 difference with the next
5. 17 | 2 difference with the next
6. 15 | 1 difference with the next from now
7. 14
8. 13
9. 12
10. 11
11. 10
12. 9
13. 8
14. 7
15. 6
16. 5
17. 4
18. 3
19. 2
20. 1
Of course, if implemented this new system should not affect the current seasons.