I don't buy the predictive ability, but I have a really cool collection of Tarot cards because I like this kind of thing and love the art on the cards.
+1, though in doing readings for myself I've gotten some... interesting results a time or two, more in the "you know more than you're consciously aware of" vein than anything else.
I collect them for the art value, plus they can make good creative spurs. The classic Rider-Waite deck, the Mystical Cats deck, and D. J. Conway's Celtic Dragons are the ones I seem to "click" with more when doing inspiration draws or personal readings, though I have several others: a few other dragon themed decks and oracle cards ("oracles" are ones not using the standard tarot configuration), the Ted Andrews "Medicine Cards" animal deck, Stephanie Pui-Mon Law's beautiful Shadowscapes deck, a cheap aimed-at-teens "Mystical" tarot with subtly marked backs for card tricks, an oddball round tarot deck and "psychic tarot" deck I got for free, and the "Tarot of the Cat People" (which has decent art, but I always got kinda a weird, out-of-synch vibe with it, so I don't use it a lot.) I also have an oddball "Story Card" deck, with simple concepts/pictures (Ladder, Chasm, etc.), which I use sometimes for spitballing: draw a few cards and try to come up with a scene or story that ties them together.
The Osho Zen deck is pricey, but the images are good intuitive/creative sparks - keep hoping to track one down at a discount.
On my wish list is a good gryphon deck; if I ever win the lottery, I have dreams of commissioning one. There's a lot of potential there for awesome interpretations with gryph variants for the four elements, not to mention the major arcana... Seen several dragon decks, but never run across a gryph one.
Oh, and years ago at a con I got a sample card for the
Tarot of Brass and Steam featuring Edison as the Devil.