Pristine and cracker barrel are not the only two grades in used shotguns. A look at auction descriptions confirms it. The vast majority fall in the well used category. Handling such non mint but fully functional specimens is enought to convey the experience and let the buyer decide for him/her self if it is what he is after either to use or collect.

Museums that display only do not convey the tactile sense of a gun. Handling a Darne V22, for example, is a whole different process than simply looking at one. And each process might lead to a wholly different conclusion.