Post Xmas Sales

So I work at a large retail grocery chain and I noticed something today that some people may find interesting. I certainly do. A whole section of the store was dedicated to holiday goods(decorations, diningware, junk gifts, etc.) and was dwindling quickly on the Eve, selling at full price. Today, two days later, it's all fifty percent off. All of it. It's still the exact same merchandise. And will be next year. And five years down the road. What makes it suddenly almost worthless? Simply our perspective of time? What if I bought a shitload of it at fifty percent off and saved it until next year, then sold it outside in the parking lot for slightly less than they sell 2009's goods? I could make a killing.