Slick_JMista: Please let there be unlockable free games based on the amount of purchases you made like they used to do back in the day. i remember getting so games like sunless sea and dreamfall chapters with those special events.
It mustn't be a special. Buy 10 games get 1 of your choice free. (Sum-total / 10) - x% = price range of free game to select from. This would incentivize people to purchase outside of sales. If GoG were adding the amount as store credit it is very well possible to get numerous games for free instead one very expensive one.