Thank you for defining grey market vs black market. Why are you arguing with points that no one has made?
Totally agree dave859, I’ve been using them for even longer and never had an issue!
Just think it's unfair to brand cd keys in the same vain as a market place like g2a. I've been buying from them for 5 years + as have many others on here. Honestly i don't give a dam where they get the code from as long as they check it's working before selling it me. If for some odd reason it doesn't work Microsoft are very helpful and they will tell cd keys when the key was used, if it was before the sale they refund the customer.
Could have* changed hands* before an* online shop. Your statement is utterly false. Keys sold through authorised resellers have not "changed hands". The origin should be of concern; you don't have much protection if you buy a grey market key and discover it's already been used.
No key comes with a seal of approval, keys could of changed hand 2 or 3 times before a online shop sells them to the public. The Origin of the keys and path it takes to cd keys isn't any concern to the buyer as long as it works does it matter?