We pay $20 per ticket for our local schools trivia night and that doesn't include food or drink (it is all BYO). Excellent professional quiz master though and great prizes. I just think of it as a donation to my children's future school. I would totally pay for child care and $10 seems reasonable. It all depends on your target market though - we live in an affluent suburb!

The only thing with child care is you'll have to think about how late the event is going to run - ours goes until at leas 10:30pm and I don't think many people would like their kids still out of bed by then...