The camp stuff doesn't re-sell for much, getting the storage space back is a bigger incentive when bulky things are involved.

After getting the teardrop trailer I sold off one tent to a young couple who were just getting started camping. They got a great deal, I got some space back. Still have four tents. Hadn't used them in a few years but it was an unusually hot summer (even at 3700 feet), the teardrop's not air conditioned, so out came the old REI backpack tent for a couple trips. Was darned glad to have it.

My preference is to give things I don't need to family or friends who I know will enjoy them. A niece who lives in Costa Rica has become an avid hiker in the mountains there so when she visits she goes home with hand-me-downs -- last time, a backpack and survival gear.

Here I am now discovering new utility (boiling water) for old gear (1990s Candleliers). So no rush to unload stuff that hasn't been used for a mere year. I have canned food older than that.