I absolutely agree. I've always posted this same thought, though most people will not pay any mind to it. It's the same thing as things going on sale at a store. If there are no more items, no reason for a sale, but if no one is buying them, mark them down.
However, there are some folks who have luckily applied the discount to their current reservations, but what they don't realize is it's because there is availability at that resort and it's easy to do, but if a resort appears near full, that resort will not have any discounts. For example right now for the current spring AP rates, there are hardly any discounts available at the Poly, but yet everyone wants to apply a discount to their reservations, most are going to get stuck with rack rate. Probably the worse ones are the ones who book with no intention of paying rack rate. I say, book what you can afford to pay at rack rate, then upgrade if possible to a discounted room.