I do...each deck of mine has either a double-terminated or a "transmitter" (?) (one end is a point, the other has many points, a type of self-healed).
I keep a med. sized cluster of amyethyst in with all my decks (it's a deep, royal purple - lovely). I also have a very clear double-terminated quartz, an egg-sized amethyst point, and a disc of labradorite that I use when doing readings.
So, when I get ready to do a reading, I spread out my little cloth, and arrange the deck's crystal along with all the other stones I just mentioned, into a pentacle, with the cluster at apex, the labradorite and the amethyst point at the arms, and the two quartz crystals at the legs.
So you can see I'm a little overboard with the crystals.