Bang on the buck Cain, i think loam would be a good alternative. With everything i said about being much fun to race on and with what you said on top, would determine this being a better alternative, long term wise.
With Loamy surfaces, you'll find racers will just keep coming back for more and the Tyre factor? i have used a good set for over a season with minimal wear. Ok i had to have two sets, one set for when the track is new with loose earth on top and another when it gets packed, thats it for the whole season