I don't think castles, especially the moat and bailey types discussed in the article. Even those built of stone required maintenance to last longer than decades, especially if you want something usable and not a ruin (and at the time, any construction that's not in use would likely be dismantled, with the construction materials to be re used).

But I agree that money played a part: castles were the place from where the local lord was controlling his estate, extracting taxes from the local farms and controlling the military force that would prevent other from trying to pillage/forage on his lands.