The amount's something that the organizers will have to sort out. Too little, and nobody goes in; too much and it's too easy to buy a trophy. Setting that amount is above my pay gradeMy thought as well. Might be interesting to resurrect this old thread?
But $45K is way too much. For that we could all buy used 150s and re-license them in Experimental-racing/exhibition and still have money left over for a bunch of modifications.