Or they do something silly where there is an "Online Convenience Fee" when you buy online, but if you try to buy it at the box office, there's a different "Box

Or they do something silly where there is an "Online Convenience Fee" when you buy online, but if you try to buy it at the box office, there's a different "Box Office Ticketing Fee." The event promoter should pay the cost of their ticketing service provider(s) out of the money they make, not have the purchaser pay it separately.