It isn't about these teams existing its about these teams being realistic about their ambitions. Wigan St.Pats don't have dreams of being an SL club, why? Because they know such a notion is ridiculous. St. Pats still exist though they have a limited ambition and that is to be the best at the level they know they will survive at. They could of course put out masses of press release stating their ambition is to be in SL and to compete with Wigan, it would of course be a waste of paper.
If you are comparing small clubs with no supporters then London Broncos matching Wigan should be a waste of paper. Comparing Wigan St Pats to semi pro clubs like Fev Rovers is just ridiculous.