Yes, I'd say be very very wary of galleries. Of all that I have been to and know, there is only one person that I actually trust in the industry and that is Maggie Weston of the Weston Gallery in Carmel, Ca. I have hear horror story after horror story of galleries selling artists' work and never passing along the proceeds. Galleries even just outright keep the artists work and never return it. I read of one photographer who showed up at a gallery with a few burly friends and 're-claimed' his prints on the spot.
Personally, if I were an artist I'd stay away from a gallery.