Point of view from the other side.
I'm on the committee for the Necton village charity music festival and have been for four years
My job is to find and book the six acts.
All the profit from the events is split between three charities.
Noone working on the day is paid EXCEPT the bands. The committee chairman would like me to find at least five free bands to increase profits. I refused the first year and someone else did the bookings. The disaster that followed (on a par with a very bad open mic night) made them see sense.
Since then, every act gets at least £150 expenses. I'll usually try to get the headliners to drop their fee down to maybe £500 but one, has actually refused payment and just taken the expenses.
Our bar is run by the committee and village volunteers do the parking We pay for security, medics tent, the stage, sound system and engineers and the 50Kw gennie. None of the organisers and helpers get paid. Bands also get a free burger each and a drink. I would never expect a band to play for free AND be out of pocket.