There are a lot of people that went from a Jailbroken 1.1.4 to a stock 2.0+. I considered leaving my v1 JBen and leaving my 3G stock, but that didn't last long at all. the customization for me is well worth it.
Yep, and I'm one of them. I'd be happy with a stock 2.1 if Apple would loosen up the SDK restrictions so some of my favorite jailbreak apps could go legit. It's really just a couple that keep me coming back to a jailbreak:
Winterboard (or ANY customization for that matter)
Tunewiki (Not gonna happen )