Fair enough. I guess it doesn't matter to me most of the time.
Pretty much my thought. I have pretty solid spam filters and a pretty secure password, so I'm not worried if people end up getting my e-mail address. I'm sure it's on Google somewhere anyway. And if I'm registering with a BS username I probably don't care if the site I'm on ends up selling my e-mail to someone, since I don't care about the site to begin with. It's mostly convenience for me (I don't register on too many sketchy sites anymore) so I don't mind using my regular e-mail addresses.
I know, right? This is pretty much the sketchiest site I use. I mean, it's run by a gay Canadian, and there's also a gay sailor. There's a guy who can't get laid who lives in California. It's a pretty scary place altogether....