Eh? I think you’ve missed the point. Grey market keys exist like this because games are sold for five-to-ten times less in Russia than they are in Europe / Oceania - if we didn’t have such an enormous price discrepency coming from the seller, there’d be no reason to sell grey market keys as they would not be profitable, nor would users be looking for them.
When a game RRPS for ~$100 in one country (e.g. Finland), but ~$5 just over the border in another (Russia), you are creating the problem.