I'm with Rock on this one " How many shop knives does one guy need " . I've had a few I couldn't fix. If its a handle problem I'll grind the handle off and put a new one on. If its a blade blemish , and I cant get it out without destruction , I'll finish it and give it away. I mark em but on the "off" side.
I recently had one that about 3/8" of the blade was a bit thin going into the oil and it warped. Not real deep , but where it was at , near the ricaso, it couldnt be ground out. I wen ahead and finished the blade. I did the rod test on it and it passed NP. I sharpened it and it took a scary sharp edge. I had to show my son what was wrong with it , he couldn't find it. I decided to go ahead and finish it , I'm giving it to my best friend for BFFE day , lol.