As a long time seller on Amazon, I can tell you that they only reach those lofty prices when Amazon runs out of their stock. In the case of this set, that was for less than two weeks. Given the time that it takes to ship the product to Amazon and for them to process the receipt of it, you can easily go broke trying to hit that window. Used to be, you could flood Amazon with your stock starting in September and keep it in stock until that optimum time to sell it. However, the last few years, AZ has raised their warehouse prizes such that it is very hard to make a buck in that fashion. It's easy to pick out a small windows in which a set had a handsome return. Actually taking advantage of that window is an entirely different matter.