When I sell, which is not that often, I tend to go well under market, and have several times sold nice pieces for what the 'Gon bluebook indicates is an all time low. I want a quick sale, and I want the buyer, if at all possibble, to be a very happy camper.
I also tend to list most pieces, even very clean ones, as a 7/10; I just don't want any disappointment (obviously, this interacts with my low pricing). A minor pet peeve of mine is people who list older, well-used, pieces at 10/10. Really? Did you turn that sucker on and off with telekinesis?
Philosophically, although I am far from extravagant by the standards here, I expect to spend a little money on the hobby; I feel little compulsion to make money or break even. If I enjoy a piece for a few years, and come a out a bit behind on the sale, I feel just fine.
Of course, I'm a light trader; YMMV.
John