I just seem to be adding "keepers".
I love the ones I have so don't want to be rid of any. I don't know how I'd choose which to sell. Most all get at least a few days in the field every year.
I don't have any that are "to pretty to shoot".
When I see a quality gun in the configuration I like, I get it. I watched a Francotte and a Dickson each for about a year before they finally came off the market.
I had remorse for not buying them prior to their sales. I happened to see both for sale a couple years later so I quickly snatched them up.
They make me happy so I'm pleased to own them.
It's easier for me to add another safe instead of selling any shotguns.