I was under the impression from some people that they were (i.e. having to sell a certain number of tickets or pay difference) but if they're not, good. I would think as a musician you'd be happy that people didn't want that stuff promoted. If I'm wrong about this specific booking guy, I understand you correcting that, but the tell mom thing just doesn't seem well thought out.
I think it was pretty lame how you said Jason wouldn't be happy, implying you actually know him or what he believes in/stands for. The bands on this show may be given tickets to sell but I am certain they don't have to pay any difference or sell any exact amount. Coming on a public forum and bashing somebody with bad info isn't cool, nor is paying to play.