Tickets, or $20 at the door are the same thing.
I disagree with that.
The band is a tribute, and say what you want about tributes, they can make great money, and never sell an album. They will never be national, and never be a household word.
Actually - a surprising number of tribute bands ARE national (or even international). Dark Star Orchestra, One Night of Queen, Zoso, Damage Inc., etc.
...and I'd argue that tribute bands do benefit from the "known entity" thing - in fact I'd say it's a large part of the reason tribute acts can do so well.