Looking at the line up for this event, most if not all the bands and artists have done and will be doing paid gigs at this very venue.
No one's getting ripped off, no one is being denied a booking and getting paid for it.
It's one if the last venues standing in the area. Local musicians are supporting a venue that has supported them.
It may not make a difference, people don't seem to want to go out and see anything other than tribute acts, or cover bands performing very well known songs. It may only give it a short term boost in publicity etc but at least the musicians involved can say we support you.