I've always liked to compare Tarot decks for their symbolism and therefor never had just one deck. I started studying symbolism and esoteric belief systems (for lack of a better term) a while before I started to actually read with the decks I had.
And only during the past few years, mainly due to the easy availibilty of things via the internet, I have begun to buy decks I knew right away I'd probably never read with. With 800+ decks, I can't pretend not to be a collector. But I'd rather give away my collection than stop reading Tarot, so that's where my priorities lie.