The 'genius' of Lego is that the pieces from one 'build one thing' set work with the pieces from other 'build one thing' sets. I had a ton of those as a kid and they all ended up just being source material for whatever I was building. As a kid, whenever I saw new sets the things I was most interested in were all of the new custom pieces. "Wow! That set comes with a shark!" instead of "Look I can build some underwater vehicle!" I don't think that I ever rebuilt any of my sets after they were deconstructed back into 'source material.'