When you have an audience of people who are forbidden from leaving, you have some level of obligation to use their time wisely. The myth of "yeah you're forced to be here, but it's for your own good!" really breaks down when the "good" use of their time is intentionally annoying them to extort money. I hated things like this when I was in highschool. It made me think (often rightfully) that even from an academic perspective my time would have been better spent at home playing Counterstrike.