Here's my two cents:
I started off lurking on this site back when the PS3 launched. At the time, I was a huge Sony fanboy, and I wanted to see the PS3 dominate. Obviously, that didn't happen. I still came every week for the sales. Eventually, I joined the forums to give me a reason to come while I waited for the sales. As I spent more time on the forums, I became less of a fanboy, and I didn't care as much about sales. Now, I still look at sales occasionally, but I'm just not all that interested in them now. I imagine that I will be if/when the PS3 slim comes out at a reduced price, and the holiday season is always interesting.
One of the problems with the site, I think, is the lack of interesting threads. This might be because it's summer, which are usually slow months, but I'm sick of the billion threads about the PS3 slim, how Uncharted 2, GoW III, MAG, etc will dominate this holiday, etc. The off topic forum has gotten pretty boring lately too, which is sad. I'd like to see some more original threads, to be honest.
The game database is a cool feature, but I don't use it a whole lot. I've written a review for inFamous as well as trophy guides for inFamous and Flower, but that's about it; I just search the web for info on games. I would like to see more incentive to write guides and reviews because they could add a lot to the site (and I enjoy writing them), but right now, I don't see much reason to do any of that.
The only other thing I'd like to say is about the news. I read a lot of news on VGC, so that's one feature that keeps me coming back. I tend to read all of my news either on the forums, or in the news section on the site and then I'll search for it on google news to see if I can find any more information. VGC is where I find nearly all of the news I need though, so that's a very good thing.
Really, this is a great site and I don't think I spend more time on any other website (possible exceptions include Google and Facebook). 