I got the info about the time being a bigger investment than the monetary investment right from a promoter.
I agree that many dealers are collectors and they'll spend more money.....right now. Given enough time the new collectors will be the collector/vendors in the future. That is if they stick around the hobby. How many trips do you think a new collector will make to Columbus if the lot is empty on Saturday morning when he gets there? The same thing goes for Iowa Gas on Friday.
It would be nearly impossible to stop the early selling, but it would be very easy to put a halt to vendors leaving early. I think if they had to stay for the advertised days and time of the show, they'd be less likely to get there 2 days early to sell because of the added expense.
Wanted: Gas pump globes:Sinclair & affiliates, IL companies. Ripple bodies. Anything Sinclair, Stoll, Pierce, 4 Bros.
http://www.lastgas15.com/