You have a good point from a Promoter/Fan/Usac Caliber race team. The other side to that is, many locals go elsewhere when their is a USAC race at there home track. If you are not one of the best twenty sprint teams, why race. When the locals do race, they are in the way, and if one of them causes a caution everyone complains "why is he even out there?" In terms of tracks like Anderson, and the others that run lower class cars, the promoter is probly doing "charity work" but the low budget racers have a venue to race at every week.

If it wasn't for so many races, the other couple of hundred racers that arn't in the elite twenty would have to go bankrupt to compete, or stay home. Higher purses have never, in the history of racing been proven to offset the cost of racing, it usually leads to more play money for more expensive technology.
Im not saying you are wrong, I just believe their is two distinct sides to the story.