The big problem with selling "blems" is that when someone else sees and mentions the poor quality, the purchaser never seems to mention he was a cheap azz and tried to save a buck, and it's the sellers reputation that takes the hit.

Same as installing cheaper parts, or customer supplied stuff. When the parts turn out as crap, el cheapo customer never steps up and admits it was his fault - the builders rep takes the hit.

In these cases, let the SELLER beware . . .