Would you please explain what was being sold at the WGH show? I spent both full days at the Philadelphia one, and saw very few dealers selling things that were not related to Thomas the Tank Engine.
The main reason so many show up is TV, radio, newspaper, and billboards advertising it.
The one I went to drew over 20,000 for 2 days with plenty of kids. Very little for sale and more like a quality day out with the kids.