I play a lot of regular and nightmare mode and having to build and then take apart the different encounter decks all the time is kind of annoying. I know that some people buy extra copies of the deluxe boxes and adventure packs so that they can have all the encounter decks pre essembled. I am considering doing this, as it would also allow me to have more player decks built at once as well, but I was wondering about how many of each I need, how it affects storage (the game already takes up a ton of shelf space), and whether it is worth the time save. Does anyone have any insight one way or the other?

Well there are two versions of every quest (normal, nightmare) let's not count ready mode. So that's two of everything. Plus two (maybe three) additional deluxe expansions for all the duplicate encounter sets for each version. So that's six of each deluxe!