I have a habit of going into Guitar Center, heading to the used section, and running the racks. If I find something I can't live without, more often than not I'll buy it. Here's my question. I know the GC salespeople work on commission. If one or more of them talks to me when I'm checking out used gear, should I make sure they ring me up when/if I buy something? Sometimes I look for them and don't see them or they're busy, so I just go to the counter and pay whoever is working the register. Last weekend I spent a few hours at a local GC - one guy pulled a guitar down for me, checked in a few times. I did buy a guitar, but he wasn't around when I went to check out. I did see him as I was leaving - he said something that could be interpreted as sarcastic.