I once heard/read an interview and they were speaking about piracy and Russia. They said that Russia has one of the highest piracy rates in the world and to try and counter it, games are released dirt cheap. The keys they sell are generally legit keys that have been bought very cheap (from Russia obv, hence a Russian key) and they sold on at a small profit. I'm not saying there are not websites that sell illegal keys, but 99% of them do not. Very few people (in fact, I know none) have their games removed.
The reason I don't trust them is not because of the key, but because I don't trust the people behind the website. If I lost the key its what, 20 quid lost, no big deal, but if they **** with my credit card, they can take it all out.
They counter piracy over there by selling games dirt cheap? Do they not realise that will most likely increase piracy rates worldwide considerably?