I wouldn't consider bisexual sites as a part of the gay market really. (When I do a search in the MANcheck search engine only 31 sites use the word Bisexual in their site description.)

I might be generalizing a bit here, but I personally feel that once gay men accept their gayness, they're interested in seeing cock. I think bisexual sites cater to those guys who are either confused or in the closet or are scared of someone finding gay sites on their computer.

Now before y'all jump all over me, I do believe that there are real bisexuals out there. I just don't happen to believe that many of the men who claim to be bisexual really are. I always have believed, and still do, that it is a step out of the closet to see what the air's like.

I'd market bi sites with the straight crowd, not the gay one.

Cheers
Dzinerbear