I'm gonna have to disagree with them going up in value. If you look back, none of the architecture sets have gone up in value by THAT much. In my opinion they are overpriced to begin with and you're paying for a nice box and instruction booklet rather that a well-designed set. They don't have any minifigs and the only pieces that are not easy to come by are the black tiles with the name of the building printed on them. With that being said: FallingWater and the White House are the exceptions and I can see them going up, but only marginally. Falling Water is a gorgeous model and very fun to look at and build, don't get me wrong, but the series as a whole is a little lackluster.