You're forgetting reason 4, which applies to the majority of people.
1) Oh please, we're on a video game sales site. We wouldn't be much nerdier if we rode around on segways with thick glasses, dressed up like Spock (complete with the ears).
2) I'm sure pretty much everyone's worked it out by now.
3) The majority of people will be anticipating games that the majority of people anticipate. So why would they be ashamed?
And reason 4:
4) NOBODY CAN BE BOTHERED. It's enough work to add all the games we own (and a pretty lengthy procedure; unlike something like Playfire, where you type and click, on VGC you have to search, click, and click again. With Playfire, it's all on the same page. That's why I've added all of my games there and not here) without adding all of the games we WANT.
(Former) Lead Moderator and (Eternal) VGC Detective 
