I agree that the people trying to sell you stuff gets very old. However, the door stamping is annoying, but it makes sense. There are kids that come in there and bang on stuff, and people bring their own instruments in to either get worked on or try out amps with, or try to sell and decide not to. It makes sense that they make sure you officially own what you're leaving with. Though, I wouldn't mind a free guitar or two, either.