BigCoffinHunter here. I've been reading Stephen King for about 18 years now and started collecting his stuff about seven years ago.
If you're just getting into collecting, I warn you, STOP NOW! If you must collect, try to keep it simple, which in turn will keep your retirment funds safe. Collecting Stephen King is a state of mind. You keep telling yourself "If only I could get this one piece, my collection would be complete, and I'd be happy..." But guess what? It never ends... A matched set of Dark Tower I-VII was my "Holy Grail," and yet after acquiring mine only nine months after starting my collection, I just couldn't stop. Over $50,000.00 later, I'm still not satisfied.
Thankfully I'm only 24, and once you old timers start dying off: All Your Base Are Belong to Me! Muahahaha
Oh, and for the love of God, don't try to outbid Wizard, lest you be caught in the crosshairs of his mighty collecting pistols of doom