And my 2 cents is that it's a hassle buying tickets at the Black Cat. You ask the person at the front desk, someone has to go get the manager, the manager has to show up, and then he goes and gets your tickets. The process usually takes 10-15 minutes, or longer, which is not convenient.
At 9:30, you pull up to the window and buy tix straight away. Or you buy them online. I've missed out on some shows, but it's always been because I waited too long.