Forty years ago in school, I bought a Raven 25. Nice, concealable. Then, I took it apart and saw the hook that was the sear. Traded it on something. And, while in school, I paid $1 on a raffle and won a Rohm or some other German POS. It was so loose and wore out I wouldn't even shoot it. But, I sold it for something like $15 and had a nice party.
More recently, had a Walther P22. Had it for a couple of years and then did a detailed cleaning. Saw how thin the barrel was and got rid of it. Had a H&R Partner 870 clone for a home defense shotgun. Had fired it a couple of times without any problems. Then took it out for an extended session. After the first couple of shots, I couldn't get it to rack. Sold it at the next gun show, and actually got my money back out of it.