I'm a tarot newbie, but over the years I've had a succession of hobbies that had me collecting. In retrospect, no, I really don't need all the stuff I've acquired. On the other hand, they were great hobbies at the time, they fit within my entertainment budget, and I had a lot of fun. Luckily for me, I mostly stuck to small things that don't take up huge amounts of space, so I don't really feel the need to cull more than I have by now. Every once in a while I rediscover a bit of treasure, and enjoy it all over again. Having a lousy memory is kind of a help, in that sense.
I like the idea of tucking things away for a while, just to gauge how strongly you feel about any individual deck.
In terms of tarot decks, part of the fun for me is choosing a deck at random sometimes. I keep my decks wrapped in cloth for their protection, but it also helps me choose a deck without knowing for sure which is which. Some of them are larger than others, but all wrapped up, I'm still not sure what I've got til I unwrap it. As others have said, images that aren't totally familiar are sometimes help spark my imagination, so that's a good thing.
I guess I'd be reluctant to ditch a deck I might not be able to reacquire, if there were any part of it I truly enjoyed. Some decks just weren't for me, so I let them go pretty quickly, but I guess that was just part of learning which styles are for me.
