You know, the buyback thing has a simple solution. Create a "B event" for the first round losers who want to go more rounds. Pay your $10 or $20 up front, and all the first round losers who have paid into the pool get to race for all the cash in that pool. I've never agreed with a buyback that allows you into the second round against the pool of racers who just beat you. If the track is on board, you can even then run an A Vs. B final. That is somewhat like the way a curling bonspiel is run.