Templates can cost alot of money, although you get what you pay for IMO
Medeval themed games are actually quite interesting but i think the person above me is correct in saying they don't make much money although I think Dave/Peter did quite well in a templar based game.
Why not switch to a 3 masons idea people are always curious about them ;) curiosity is always a good marketing technique, you can easily read up on the 3 masons and make up afew storyline.
Although i wouldn't make it too crazy as the 3 masons are everywhere ;) lol i bet there is atleast 3 masons on MWG (2 i know of)