What do you think about the idea to use some weight handicap system instead of the elimination of sponsored/fast/well equiped drivers from stock classes.
This method is applied now for some real touring cars racing series.
Approximately so:
Any driver has won stock race - he must put additional 50 grammes ballast on the car for next race.
If this driver has won next race again - add 50 gr. more etc.
For the second and third places the weight addition is less.
Speed of fast racers will fall soon due to ballast and some driver can win the next race even with old GTB.
There will be some ballast weight variable ranking for each driver according his current racing history.
Similar change of rules will not demand additional expenses from racers (except possible purchase of lead), will allow to involve top-drivers for stock races, will equal chances for new and old ESC, will make races by more fascinating.