I think he always has been a suit: http://guykawasaki.com/about/index.shtml

He got his MBA, then got into evangelizing about Apple through a friend. I think I would count MBAs who evangelize about Apple as suits.

Edit: By the way, nothing about being a suit means you're not nice, of course. I would assume that most suits are probably nicer than most hackers, because it's the job of a suit to say nice things, while it's the job of a hacker to say true things.