There are a TON of chat sites out there so you should try to come up with something more original that no one else has. I was surfing some of those chat sites the other night and the girls looked SOOOOOOO bored sitting there chatting with dumb horny guys all night.
The public nudity/voyeur stuff is a growing market, maybe you could have live wet t-shirt contests or something instead of live chat. The members could vote on who wins, so it's still interactive and fun. Whatever you can do to keep them recurring.
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I'm too lazy to run this shit.