Oklahoma here. Will vouch, the Oklahoma cons are EXTREMELY guilty of this.
There are 2 anime cons in OK--Tokyo in Tulsa (the worse of the 2) and Izumicon (generally the better of the 2, but still not great. Was recently bought out and the new site's a trainwreck)
Both are small conventions, but charge $70 for the weekend despite their small size. They never have worthwhile guests, dealeer's rooms and artists alleys are tiny and usually have less than 5 actually good artists, and just have nothing to do in general. You'll likely see less than 5 good cosplays throughout the whole con, and the congoers are generally young autists. Tokyo in Tulsa especially has received a lot of criticism for unmanaged lines, lack of interesting panels, and of course, the exorbitant cost they charge despite being such a small con that hasn't shown any signs of significant growth. As for Izumicon, last year an ice storm hit the weekend it was supposed to happen and several guests/panelist/dealers/artists cancelled, which shrunk an already low congoer attendance. Lots of people felt ripped off about how much they paid to be there, but as far as I know, received no refund. They got bought out, but if the new site is any indicator of how it'll be run from now on, it's still not gonna be great--definitely not worth the $70 badge. But lots of people will pay anyways because they don't wanna save their money and drive to Dallas for a decent convention.