Zero minus expenses:

The current financial ‘ guarantee’ for most musicians in clubs: They are expected to pay the sound and door people, who have minimum guarantees, out of the money fans pay at the door.  Thus, the only financial certainty many musicians have regarding an evening’s work is that they’re in the red somewhere between $100 and $1000 before they’ve played a note. This necessitates that they do more advertising, shifting time away from making great music, aka ‘Insult to Injury.’