You're partially right in the sense that I will support a team that I feel represents my state, not only geographically, but more importantly, culturally. The Broncos and Cowboys fullfill that premise...
Unlike NSW, there isn't any secular rivalry between NRL teams in Qld.
If 3 or 4 BRL teams had been promoted to the NRL, the fierce rivalry would probably change the picture completely.
Geographically, the Titans are located in Qld, but right on the border with NSW, where they choose to exert most of their influence. Their team is composed of a majority of NSW'men and very little in their culture identifies them with Qld. This puts them on the same foot as any other team in the NRL as far as I'm concerned.
The other preferences I have, just grew over the years for a plethora of reasons, be it friendships with people supporting those clubs, favourite players, playing styles, etc...
I can't see why that's silly tbh.