We sell tickets(the kind that come on a large roll) that are used for all food and game booths. I've never thought of this practice as "treating someone like a child". I think it keeps money-handling much easier. We have 2 tables where tickets can be purchased, and we bundle them up ahead of time, 20 plus one more free for $5. As they are used, booth workers re-bundle them in 21's. A Board member picks them up every once in awhile, keeping track of how many each booth has turned in. The re-bundled tickets are returned to the ticket table, and resold.
As for the Lollipop Tree, that is a traditional Kindergarten class booth. I would have been tarred and feathered if I had taken that away! Knock on wood, we've not had any problems with the safety of the lollipops.
I hope you can find help with the planning. We have 4 chairmen for the Carnival: Game Booths, Food Booths, Auction, and Classroom theme auction baskets. Thankfully, we get plenty of volunteers---well, most of the time. Some of the room parents have a hard time getting volunteers to work a 30 minute shift.