That's pretty sweet.
I was never all that sure of how to be "friends" with the GS employees, but I figured the most I could do with one that I hadn't met yet was to greet them everytime I walked in. I don't ignore them when they ask me if I need help finding anything, and when they're forced to ask me about preorders, I might ask them what's coming up (if it's not busy at the shop).
Usually they're the ones who're pretty nice at first, commenting about a game I picked up, and conversation goes from there. Also, me walking in there at least once a week probably helps, too
I thought all the employees would be all about the FPSes, which I think they still are, but they also recognize that I'd be possibly be into things like Etrian Odyssey, Pokemon, Fire Emblem, etc., whether I actually am or am not.
Long story short, I didn't think I'd get familiar enough with them where they'd be willing to give me promo display stuff, but it's slowly getting into that territory. Took a while, though.