The Shemale niche is a much better converter than others, such as fat/BBW or ebony, which have always been poor converters for me. As for sponsors:
Topbucks
Adult Players Club
Porn Access with movie FHGs,
CECash
Platinum Bucks
Silvercash
Triple X Cash
Adult Elite
Flashcash
they all have shemale sites with FHGs and convert well.