The profiles on them seemed like mean, skanky bitches
A lot of them are ugly even in their profile pics.
That's because most of them are!
And here's the inherent problem... Even the uggo chubbers get massive hits from men just looking for a little action.
Here's something interesting: My Ex and I both had profiles up on there briefly at one point. Both of us are reasonably attractive people. Now, I could barely get responses even from 5/10 chubbsters (tried just for fun... i don't 'do' chubbsters), yet when I asked my Ex, her inbox was filling up on a daily basis with hits from men.
So you see how the odds are on these sites, for men. They don't work well for men. In the end, we both shut down our accounts. My reasoning was that it was too depressing. My Ex, I believe, wasn't really into online dating thing in the end after all.