I cant remember when it was but I think somebody had posted a system that includes a multiplier for factoring the number of entries in a given class. As for the quality of the field (the no name racers vs National Champions), that is a good question. I know in full scale endurance racing they have a system (if Im remembering it correctly) of Platinum, Gold, Silver and Bronze for racers and something along that line could be used and there could be a weighted mathematical formula (Im not great at math beyond geometry so maybe you could come up with that CarbonJoe) that could add bonus points for racers who compete "above their classification" or something like that