a friend of mine has 11 str8 sites and he does fine at $34.95 - on the other hand, each site gets those other 10 sites as bonus sites, so they do have a lot of content and updates in one site or another every day...

the scarcer niches sell fairly well up to $34.95 however unless you have plenty of content and nice long movies, the site will probably see a lot less retention - possibly enough to make each member worth less overall even though he paid more to join.

your best bet is to mirror your tour so you have 3 different prices and run traffic past each one and see how they do. ultimately each webmaster may have very different experiences.