Just few comments
One thing about the crazy priced games. It is frequently done to stop people from asking how much for the game. Putting not for sale on the games seems to encourage people to make offers and try to talk you out of the game. (I lost count on how many people tried to buy Fathom from me this weekend) Oddly enough when you put a stupid price on a game, people leave you alone.
Classic arcades was registered but didn't show up. I have no idea why.
The outdoor flea market is still offered. Take a look at the registration form if you have any doubts. But when given the choice between indoor and outdoor, the vendors pick indoor. With how often it rains on the weekend of the show, it is no surprise. The flea markets have changed, the stashes of project games sitting in operators warehouses are all but gone. Ebay and the high value of the games has done that and there is no going back to the flea markets of yesterday.
As to stopping people from removing games early, you try to deter them with fees, but when people just spent a few thousand on a game, what amount is going to make a difference?