Another idea or two ...
There seems to have been a bit of controversy over kids at the shows, and like others have said, reptiles are a family affair in my house. I have an 11-year-old who wants to start breeding her own, and is certainly capable of making purchases at shows (with the animals checked and approved by mom, of course).
I think a reasonable approach would be (using Evan's ticket pricing as a guideline) $6 for adults, $3 kids 4-12, kids under 4 get in free, $5 per stroller surcharge. If listed on all the promotional materials, folks would know ahead of time to leave the strollers home or in the car or be prepared to pay the surcharge. Likewise, there shouldn't be a problem banning backbags and large purses/bags, but I think that needs to be on the promotional material along with a definition of "large" so there's no confusion. And when I say "on the promotional materials," I also mean on the signs that say "reptile show this way!" or whatever, as there may be some traffic from passersby, depending on location.
Additionally, I'd like to see every show -- without exception -- provide one free table to a reputable local or regional reptile rescue. They can offer animals for adoption for a reasonable fee and have better odds of someone prepared to deal with an adolescent male iguana iguana or super-size snake taking it home. Additionally, they can offer care sheets and educational materials, collect donations, and distribute business cards. This is a win-win for everyone. And Evan's great idea about offering herp sexing would be a natural fund-raising idea for a rescue.
For what it's worth, I also really like the idea of doing half-tables for smaller vendors. It has the potential to bring more variety to the show and also gives smaller breeders a chance to bring in whatever they may specialize in. I don't think there's really any need to allow an area at the show for trades or sales by the guy who wants to trade his corns for kings or what have you, but if possible, a separate room with a separate admission for a "swap meet" would be great. Admission could be minimal and essentially just pay for whatever the cost of the additional space and any related costs may be. A plain room with a table or two and a few chairs (to allow for examining animals, setting down packages, writing up receipts or phone numbers, etc.) would be adequate.
My $0.02.