As the title say, and this maybe would have a connection with the reality, as is well known that "the good players" don't go with top teams, could be good change the 5* mx. level in the market and allow, only 4* (so a reduced market with 2*, 3* and 4*)
I 'm surprised with this suggestion because I 've seen you in a fb group so you must be aware how things are working for the top100/platinum managers.
They don't buy 5* players, not even 4*.
They buy 3* players so to increase their white skills more.
2* will be even better for them - lol

I think the best suggestion is to be a limit 7*, 119%.
After that, no more gaining from games or training.