I accept imPERFECTIONS in anything except exhibition grade crafts.
Tojiros are factory blades, and should be cookie cutter perfect, or else an engineer needs a new job. That said, it appears that machines cannot make knives without a significant amount of help from a human. The best factory knives I've ever used are from Suisin.
For handmade items, the KIND of imperfections are what is key here--you've got three categories:
1. Accidents/Oversights
These are things that the maker either had no idea happened, or just didn't get to. If they affect performance, it's back to the maker it goes. If not, then the severity and/or quantity of these imperfections are inversely proportional to how much it should cost. I accept these because it's a knife, not a Soul, you gotta stop at some point.
2. Wabi-Sabi/Character
A brilliant solution to the fact that things are not going to be perfect every time, and you can't make a living selling perfected items. You pick things that are critical, master them, and then glorify the flaws--this is what Murray Carter does. If you find beauty in hammer marks because they are signs of the hand of maker, then you can save your smith a step in making your knife. Sometimes people pay a little more for these imperfections because they are enjoying the humanity of the item, like a Takeda.
3. Unfinished parts
You sell a knife with belt marks on it, or a rough-fitted handle, or a sharp spine, you are just outsourcing work to the customer to save some time. Sometimes this doesn't affect price because it is often things that don't matter, like cleaning up that little armpit in the Machi, or removing a tiny burr from the spine near the tip.