After over 45 years playing I would never take a gig without knowing first what is involved....are we playing for free, the door, a flat fee, and do we get food, drinks, a discount, whatever.
I'd never play for a "percentage" of anything. I learned years and years ago that when it comes to money and music, trust no one.
"Just once I'd like to hear you scream in pain"
"Play some RAP music"