Just like reputable shops don't sell stolen goods, reputable repair shops wouldn't use stolen parts.
I mean, yeah, they would be cheaper, but that's the case for anything stolen. Yet we don't have an epidemic of all shops in the USA selling stolen goods they got for cheap.
Would I? If we consider that practically everything available for sale right now is also available illegally, for less, why don't people do all their shopping on the black market?
Western society is pretty conformist. Give us a legitimate way to purchase something and most of us will feel more comfortable using it. Even if that means paying more.
The people selling these boards had the market to themselves.
I mean, yeah, they would be cheaper, but that's the case for anything stolen. Yet we don't have an epidemic of all shops in the USA selling stolen goods they got for cheap.