My opinion - if you are selling something, you want it to be the best you can do. And if stuff happens, then that product is not saleable
But that leads to a different question - should the defective item just go to scrap (the burn box), or is there any value in trying to salvage it? I'm not in this game to sell stuff, so my motivations may be different from others, but when I conclude that the thing I made is a dud, I usually try to salvage it. There are two reasons. One is economy - I have invested a certain amount of time and expense in getting to that point, and I'm naturally cheap and reluctant to just discard it. But more importantly, salvaging the defective item may teach me new skills that I can to apply to a future project project.
Over the last couple of days, I've been making scoops from a chunk of kiln-dried birch that was being discarded by a nearby commercial treenwork factory because it had some defects - basically a split (birch is notorious for splitting). The first blank I cut was defect-free, but there was an obvious split in the next blank. I took some time to open the split, saturate the broken surfaces with PVA glue, and clamp it back together; I also planned the turning so that the repaired split would be turned away when making the scoop. And that worked. But what I didn't know is that there was a second split (an 'occult fault') that only showed up after I had turned the scoop. So I had to improvise - fortunately, I was able to use a little CA repair the flaw, and after finishing, its not longer detectable. So I learned something from the experience.