actually if you auctioned off "getting tf'd" + the target species separately, but simultaneously, this opens up some good game theory stuff

bidder alice just wants to get TF'd, unless it would be a llama
bidder bob wants to be pig, then cow, then horse, then llama, or not at all
bidder cam just wants to watch someone get turned into a dog
bidder eve just wants to turn alice into a llama

they all have $1000 to spend, mixed strategies GO