one amatuer championship in motorsports that gets my vote is the SCCA run-offs.
I think it is fair to determine the national championship at Daytona during ROC. Many other regions have different competition and have different number of events, so regional points can't be fair.
However it would be more fair if only racers who have competed semi-regularly (meaning some series commitment) are allowed to enter the ROC.
So a invitational ROC would be nice. CCS are still ensured a full grid because they get to invite UP TO the full grid of people. If people don't respond by the deadline then go to the altenates. CCS won't loose money that way.
If some guys is good enough (or rich enough) to have a MUCH better bike than the rest of the field. then he/she probably will win anyway. There is no stopping that. But if we can limit credentials to whoever that deserves it, it will certainly be less complains.