paladin181: Well, if you're gonig to buy a game that's on discount, buy it. If not, then don't. How long it's actually on discount is kind of a moot point if you know it's discounted now, and want to buy but don't, it's not GOG's fault. I don't get the concept of people waiting until the end of a sale to buy things on digital storefronts.
Some people buy using payment methods that charge a flat fee per transaction. Such people minimize their out-of-pocket costs by making as few transactions as possible. If you expect more games you want will go on sale before the end of the current sale, it is cheaper to wait and buy them as a single transaction. GOG's "Wallet" feature is a partial attempt to address this, but is necessarily insufficient because using it optimally requires knowing exactly how much to put in the Wallet on your first transaction. You don't know that until you have a specific list of games and their discounts. If you had that list, you could buy now instead of loading the Wallet.
Another case where waiting makes sense is if the buyer is uncertain whether he/she wants the game. Perhaps he/she would be more inclined to buy it if his friends also bought it, but the friends won't be able to answer that for hours or days. Perhaps he would be more inclined to buy if it were compatible with third party mods, or was positively reviewed by a trusted source, or ran well on unsupported platforms. The buyer needs time to research answers to those questions. If the end of the sale is imminent, the buyer might speculatively buy and hope the research turns out positively when he has time to do it. If the sale is good for another week, the buyer has time to research now, and not deal with unwinding the transaction if the research reveals that this is not a good purchase.
Finally, there is the simple answer: GOG previously provided this information. Customers became accustomed to having this information. GOG no longer provides this information in a reasonably useful form. Customers are unhappy that the feature was removed without good cause.