The summer heat and LGM Tables....

Disney would only give a larger and more prime location spot, if they could perfect the Butt-Meter, which is very similar to a parking meter. They'd make a literal ton in quarters!

A good idea would be to spread out across the parks at one time in a coordinated effort, and have a list of each place that people are setting up at. then as people trade(or look), send them to the other spots. try and keep a head count to see which areas get the most exposure and visits(not necessarily trades, but looks) and then rotate people the next time to see if crowds continue to flow the same. As some beginning traders have said on here and in person, the mob of traders in one location can be quite intimidating.