When I think C/G (I'm gonna abbreviate that shit from now on, too much of a PITA to type it out every time, especially on my stupid phone) I think "reseller". You know, the guys that are collecting because they're either trying to resell right now, or that are planning on it being their retirement fund.
Forte is obviously collecting what does because he's an obsessed fan with a little extra scratch to throw around. I think we've all made purchases that were only to help complete a series or just because we knew that it'd just be really cool to have. For me, one item I can think of right off the top of my head is FF8. I knew I hated it when I bought it, but when you own 1-7 & 9-10, it seems shitty to have that one title missing. That, and I got it for like 5 bucks sealed about a zillion years ago just after everyone realized that it was crap (if you feel differently about it, then I'm sorry, I just can't stand it).
Maybe we need 3 categories? G/C, C/G, and C/R (Collector/Reseller).