I'm not convinced having a shitload of games makes you super nerdy. I'm sure it's points in the nerd direction, but to what extent, I'm not sure. All I know is that my brothers and I have gotten a lot of happiness over the years simply from amassing consoles and games. It gives us something to look forward to each year when we see each other on the holidays. We play together and often talk games together. We add new items to the collection and try new things. It gives us something to concern ourselves with even though the whole thing is trivial at best.
Sometimes when you consider the games we've bought and only briefly played it seems that the collecting might be more important than the playing, and that's where it may be somewhat unhealthy. But in the end I think it gives us more happiness, so it's worth it.
We don't hang posters on the wall, we don't wear shirts. You have to open a closet to know we have the stuff. It's not like we have pristine quality old games either, most of our old stuff is gamer quality. We don't outwardly display a gamer lifestyle -- we all go back to our regular lives most of the year. I think going to cons, displaying figurines and posters on your walls, neglecting your hygeine, or having 20,000 posts on a gaming board goes much further to make you a nerd. Of course that's only my opinion, I'm probably deluded, and I'm sure some will disagree, but I'm happy and it doesn't matter what you think.