You could just lie through your back teeth ... oh no, sorry Barrie has already suggested that.

They have been cheap in the UK ever since I bought my K10D, which is one of the reasons I chose the Pentax brand. The trouble is with the release of the K-7 now is not the time to be doubling the lens prices here if Pentax want to sell the body in any great volume. Saying that, given the choice between Pentax making no profit and going under or hanging around then maybe there was no choice.
As I said before though, here in the UK at least, it is one less reason to choose Pentax from the beginning.

LINK

That does look a lot more sensible Stefan but the reason a lot of users chose Pentax was because although it is a minority brand compared to the "big two" the lens prices were quite a bit cheaper in comparison.
At this moment in time Pentax need to be pulling in buyers with the K-7 but they will never do that while their lens prices are in the same price range as most people will go for the "safer" Canon or Nikon option.

I do wonder actually if a lot of it is to do with how Pentax users are thought of by the Canon and Nikon bunch and how people feel about being the user of equipment that is (to some extent) looked upon as a cheaper option. If the K20D had come out with a Nikon or Canon badge attached I am 100% sure it would have sold more units many times over.

Camera owners seem to be a very brand orientated group (as can be seen when in a mix taking photos and noticing all the furtive glances going on). Most follow the Canon/Nikon route without a thought for anything else which must (in the future) be inferior because they never considered it.

Just my thoughts, may be totally wrong

Why not just give your money to the next wino you see sitting in a doorway .. you will at least know where your money has gone.

What I am struggling to understand is that the 10-17, 12-24, 16-50, 100mm macro and 60-135 are all made by (or basically the same apart from coating) Tokina and their prices are nowhere near the corresponding lens.

Excellent.

There is hope for Scott yet then

Not very fast on my K10D to be honest.
I bought mine with the K-7 in mind though, and the fact it was cheap(ish) at the time.

Lightroom recently got an update to handle the K-7 files.

Number 4 seems the sharpest with the slightly increased aperture, I have to agree with Scott that the first few are pretty soft. If you are thinking of a larger Sigma lens then I would be looking at the 170-500mm (excellent from what I have seen of Scotts pics) or 50-500mm (which I can vouch for first hand).