Earlier quoted context omitted.
This seems like ebay's problem. Why are they not shut down for this? If I came across some software on e-bay, I'd assume it was legit. I just checked ebay and it is full of windows keys. How am I, as a consumer, supposed to know that this is 'illegal'?
The same way you're supposed to know if a bike is stolen. If the given market is grey/shady and the price is excessively low, and you really want to know, you ask (for starters).
Furthermore, this is not one vendor selling one ‘stolen’ item, it is many, selling many keys. This makes it seems like a legitimate channel for keys to the average consumer. It also makes eBay more responsible if you ask me. It seems to me as if they are making a profit from those sales. If they truly are illegal keys then they should probably do something about it.
So why am I wrong here?