xyem: I've just had another idea, but it could be (reasonably) regarded as a privacy violation. I'm not sure if I'd want to see it implemented, but it could really help with the current situation.
If GOG would display the total number of games
directly purchased by the account holder (i.e. not freebies or gifts) then it would make it really obvious who is just here to get free stuff or scam people.
A nice idea. They could make a feature that if you type a certain string of characters, like "[#Purchases]" or something, the forum/PM system will turn it into a rainbow colored (so it can't be faked with normal text) games purchased integer, so the privacy wouldn't be an issue if you didn't type that string.
They'll never do it, but a man can dream. :p