blotunga: I have no clue, but i want to shave off some stuff from my wishlist so a sale would be welcome. Too many great new releases without a decent discount.
Gilozard: If they're genuinely great, just buy them.
Buying games on sale just tells GOG and developers that customers won't pay for good games, so why bother releasing them? The only way to get more of the games you like is to vote with your wallet and buy them when they aren't 80% off.
I really am convicted by a similar line of thinking; The better games should be in mind bought at a higher price if they really are good games, It also seems to place more of a playable value to the game than the on sale ones. I just wish at the moment I had the extra money for the games I want right now :\
I also should note I do/did get most of my games on sale and do get a few from giveaways here and there though I've been trying to curve that a bit nowadays.