where and when did this show happen?
I think if you are doing a club, you might get like half the door. Depending on the number of people who show up and the cover, the door could only be about $1,000 (maybe 100 people at $10/head). I don't know that they would necessarily do a party for the same price, because presumably they can sell merch and get more publicity at a club.
Anyway, that's my general take on it. I've tried to figure out expenses and profit for some bands that I like who have been around a long time and have a small following but haven't really made it, as I wonder how it is really worth it sometimes.