A lot of Force fans I know have no connection to the local competition. For most it is because they didn't grow up in Perth and never had a connection. We are a multicultural country. I don't see why NSW/Sydney couldn't be any different.
Adding to that, I have no idea exactly what goes on in Sydney, but if I was Penrith, Parramatta, et al., I'd be pretty disenfranchised by clubs like Sydney Uni appearing to poach talent. As an outsider, the deck looks stacked against the West (but, you know, that could be my default "the west is always hard done by")