I agree with Greenguy's list of categories. I wouldn't bother with "Hardcore" because it is almost meaningless. I specialize in gay ebony/interracial myself. Ethnic gay sites seem to be doing well, I just started a GayBoysofIndia and GayArabBoys sites and am getting traffic.
BlueLoot only has 2 sites that I can see and they are pretty generic gay sites.
James
http://blackhotboyTGP.com