@boomerang,
No, I never have felt prize winners were key reads for me, though, like you, Boom, I've read a bunch of the winners just running across the books. I do read newspaper articles about the Booker Prize nominees when I see them, though. I probably haven't bought a new book since my architecture and photography book heyday - the early and mid eighties, and even then some of those were pre-owned.
An example: I finally read The English Patient (Booker) recently - from GoodWill. I liked it... but then, I would.