@maris @fesshole I am in a handful of galleries and have been for a good while. Some of them have thrown in the towel, especially around Covid lockdown of course.
The one with which I have the closest relationship uses "shop sitters," where artists staff the gallery, and in return the commission is lower. It's still over 20% even with shop sitting. In my case it's a very bad financial deal, but I do it to support the gallery. I think most of us do that. At the end of a shift, often the day's sales are pretty low. I always wonder how the rent gets paid and the lights stay on. This is a small arts/crafts local-art gallery in Vermont. Maybe it works differently for different kinds of galleries in different markets.
I assume you have run galleries yourself so you know the financial situation better than I do. But it seems a dicey business to me. I would never try to run one myself.
i've run one gallery for a short time, but that wasn't representative for normal situations.
i look at the time it takes to paint, say, 50 paintings for an exhibition, made by, say, 10 painters.
and compare that to the time a gallery owner spends sitting there during the exhibition, receiving customers, doing some publicity, etc.
the 10 painters also have to pay rent, electricity, heating, etc. for their 10 studios.
calculate this and you see that 50% commission is completely absurd.