I know photography is more than just gear, and a lens that was great 5 years ago didn't get worse just because newer better ones are out, but I fear that if I don't sell my EF lenses soon they'll become worthless when everyone and their dog have moved on to the RF mount. I don't shoot professionally and I'm not made of money, so I'd rather not have to write off all the money I spent on EF lenses if I can avoid some of the loss by selling them while they're still worth something.