I've donated some pipes and traded others for store credit at SP. None of them were out-and-out turkeys, and most of them were fine, just not tuned exactly to my liking. If you want to be conscientious, you can mention a drawback while praising the pipe's virtues, but it's not great salesmanship. I think any of my culled pipes I could have sold in good conscience. If a pipe has irreparable problems, maybe trash is the way out. Tobacco is a judgement call. Many blends improve, or you grow into them, so jarring is a good idea. After a second or third try over time, give them to the garden as insecticide. Or send them to the landfill as insecticide.