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The company probably takes the DA L lenses off of K-30's or K-01's and sell them as "body only" and then put those lenses on the K-5 and sell the WR lenses on their own. That would make economic sense, right? I mean, they could make a couple bucks that way.
CiF and quickshift are both pretty great, a lens hood is pretty useful (and improves the IQ), and you have to use a WR lens on your WR camera for the whole thing to be.. WR. If the lens isn't WR, then you need to avoid bad weather. I think the WR is a big reason why people get the kit lens with a K-5. They use other lenses for higher quality shots, but the WR comes in handy when the weather is bad.