Any club which doesn't take account of the tastes of its audience won't last long. You can't afford to be self-indulgent when you're running a folk-club, if you want it to stay in business.

As for Springsteen... a folk club that managed to put him on would no doubt be packed out, but I suspect many of its regular audience would stay away in droves.

If you don't like what the folk clubs are providing, then why not start your own?