Bring on Tuala Morn!
I also like the lack of setting for FH, but welcome setting books of all kinds for crunchy gaming goodness.
My brother is an avid fan of HERO but GMs D&D where he lives mostly for the fact they provide lots of background material.
I've had my own world brewing at the back and front of my own brain for some years now, so setting books are not a MUST, but I think they'll be great sellers. Even very creative people can profit from a springboard.