Just to clarify: The idea of someone poor but worthy getting a windfall--a running, profitable business for only $100--is fine. If the deal goes through, and all the other participants are out $100 for having had the chance to win, that's fine (it's also understood by all, as well as necessary for the current owner--definitely not a giveaway). The $100 ticket price is fine (might even be too low). Having a minimum number of entries in order for the deal to proceed is fine.

It's the $10 hit in the event of not enough entries that smells bad to me.