>>9210286Putting together jigsaw puzzles is inherently different from putting together a lego set though. The puzzle only has one way of being put together, while you can take apart a lego set and make something entirely different with the parts in that set along with the ones in your collection.
I can understand selling sets a few years after getting them if you need the space and/or money for other sets, but who the fuck sells a set immediately after building it?