It's so true. Every reptile expo I know has had to move to larger venues in the last few years. Here in N. California the big shows are actually being held in San Franciso's Cow Palace, an indoor arena with a capacity of something like 14,000. The first expos I went to, back when dinosaurs walked the earth, were held in small community centers and maybe had a thousand attendees over the course of the weekend.
I admin a few FB snake groups. One that is specifically dedicated to new Ball python keepers is steadily getting over 300 new members a week - and that's just one little group on one social media platform. It's been insane.