I'm not sure that I agree, and I don't think that there is much of a difference. The people that play the records behind the counter at a record store pick whatever grabs their fancy that day, same as the guy that runs Nine Bullets. It's a person playing music that interests them.
But hey, I've never really been into that scene, and maybe that's me. During college, I worked as a deejay at a radio station that played independent music. A few of the other folks turned me on to some interesting stuff that I liked for a bit, but I've just not ever been impressed when people say, "here, listen to this."
That one might be interesting. In my early adulthood I worked next to what was at the time Tucson’s best used music store, and I was still living with mom so I had no where else to put my money. I always remember Jeff, who looked just like Bob Fripp on the cover of Red and was big into prog rock (so the look was at least partly deliberate), we could chat away the hours. When you hit the same place over and over the clerks get a handle on your larger musical taste, when they see you buying Black Sabbath one week, Tull the next, Neil Young after that and then Butthole Surfers today they know more about your musical taste than the guy at WalMart who didn’t work there last week and probably won’t be there next. These are the guys that can say “I know you don’t like country but you do like punk, let me put some Johnny Cash on for you, don’t think of it as country, it’s really pre-plugged in instruments punk” (roughly a conversation I actually had with a guy at PDQ, and I still listen to Johnny today).