Liondollars have a bunch of the hottest converting and great retention BBW sites:
They also have OVER 300 hosted galleries for every site in their 100+ "all niche" program and OVER 10000 unwatermarked promo pics for you to use freely in your promotional efforts!
Beyond the Fat
Huge Fat Fucks
Pure Plumpers
Their sites have awesome content, and with new sites weekly, they never get stale or oversaturated.
You'd better not forget
LionDollars if you want to seriously bank in this biz.