Honestly on 20 lvl every rewards are useless... parts, money, tokens, ok engines you can use but you can buy hundrets for tokens, so same. Have you ever think about it, to make all this things usefull??
I am sure that I have already broached that subject before. I think in terms of also giving level 20 managers points towards the hof occasionally as well.
Would be really nice if as you reach level 20 or rather, as you go up levels, the daily reward gets better and you get more stuff in scale with your level. I agree though, getting XP at max level is useless