I do have some that didn't pass "quality control checks". Some are worse than others. Some most people wouldn't notice or it wouldn't bother them. But I am out (well, I'm keeping a couple for myself) of 100% good ones. I sold one second and he said it was fine. You couldn't tell unless you were looking for it. Then again, I found about the best "second" I could for him.
Price would be cheaper for the "seconds", all depends on how off it is.