Yeah, I think the concept of someone being on a site like that is a turn off. Out of the top 50 guys, there was only 1 I thought was 'attractive', as opposed to 'hot'...but then when I clicked on his profile and got a close up, I thought 'oh no, not so good'.
That being said, I only think people are hot after a while, not on first sight usually. I'd say most of the guys I've dated I've never thought 'oh fuck, he's hot' straight up.