$17.95 is reasonable for that type of niche.
I'd get a forum setup on there for all the tranny lovers to chat together. Also let your members rate the trannies. Guys like seeing their comments posted for others to see. The interactivity will help your retaintion rate go longer.
Here is a great example of a members forum.
http://www.legsandheels.com/cgibin/w.../wwwboard.html
Its pretty funny cause its all dudes talking about feet, toenails, legs, pumps, dangling, etc. so be prepared to laugh.