Even though this discussion seems to have petered out, I'd like to add this anecdote.

A buddy of mine was in Key West and encountered a band named The Blues Vipers of Brooklyn. (They actually ARE from Brooklyn, NY, and play a few regular gigs a week in clubs there.) They play a lot of early jazz stuff, some blues, and some swing. The novelty of the band is the drummer-percussionist, who plays the washboard. They are locally quite popular, and they get a lot of specialty gigs, and doing weddings is not beneath them. They are good musicians, but it's unsophisticated stuff, nothing that comes anywhere near the sophistication and complexity of, say, Matt Finley's BrazJazz stuff.

Anyway, my buddy bought all their CDs and he -- EGAD! -- made copies of two of them for me. After giving them a listen, it occurred to me that my folks, who live in a hoity-toity over-55 community, would really dig them. After dinner one evening, we listened to the CDs, and I mentioned that the band is available for concerts. My dad said he would give the CDs to the entertainment committee of the community. They are now negotiating a $5000 concert date with the Vipers.

Even after expenses, how many units would the Vipers have to sell to make that kind of money?