What projects are you looking at that primarily only package a deb? I frequent far flung corners of the web and have never had trouble finding an RPM (have on occasion had trouble finding a deb though)
I've had both, depending on what I was looking for at the moment. Server and/or enterprise stuff, perhaps some management system for something, never offered debs. Lots of user software seems to give me debs a lot more often than rpms. It also shifted over time I think, debs being more popular recently and rpms less so.