First thing that comes to mind is buying two very large Eureka tents for family camping and - at two different times - breaking poles while trying to put them up by myself. Eureka didn't have replacement poles, and the third party company they recommended made poles that weren't like the originals. So the tents and poles sit in my basement unused since them - likely to end up at Goodwill.

BTW, I carry an ARC single AAA LED light every single day - in pocket - - with keys - for 10+ years and it continues to function flawlessly.