Thibs you actually think so.. there's just an addition to what I have written. Market segmentation exists by crippling cheaper bodies, however I don't think it's really the case in this aspect.. the cheaper bodies ARE cheaper by removing the (unnecessary) motor. From all the Nikon guys I know (true not that many) none have lens without motors; it's been quite a while since Nikon has produced screw drive driven lens, so removing something with really small chances of ever being used seems logical to me. Pentax on the other hand cannot do that since most of their lens are screw drive so Pentax is a little screwed
. Many of the ones that have SDMs fail so that is not good either. Every camera manufacturer wishes to push consumers towards more expensive (and bigger profit) equipment. In case of lens their strategies differ: Canikon builds very good IQ basic kit lens (18-55) but cheaper and less durable so more likely to fail sooner whereas Pentax builds much better (builded) kit but with lower IQ; I would prefer using a better IQ lens for less time than using a mediocre one for much longer.
Anyway Pentax strategy for lens it's not working with me as I have no desire to buy any of their current lens. In Romania the price for K-3 kit with the mediocre 18-55 is ~ 35 USd more; even at that difference I'm not sure I would buy it to use it. I might buy the kit and sell the lens right away so that I could have a lowered price for the body and somebody with a broken non WR 18-55 could enjoy it for much less than a separate lens price.
Ok.. I've been slightly off-topic for too much now so I'll refrain on commenting any further.
Good luck with your 20-40 and may it be not priced as ususal !