I'm somewhat outraged that Asus didn't include an extra charger with the expensive $150 dock acccessory
Getting back to the point you mentioned, i saw a review on Engadget (wasn't in English) and the guy pulled out two boxes. One for the transformer (he showed all the accessories) and the other for the keyboard ( he himself looked surprised there was nothing by the keyboard in)
So 150 for the keyboard without anything else, yet the keyboard adds USB ports, more battery juice, an actual keyboard and turn your tablet to the first honeycomb laptop. I think the cost here is pretty darn good.
I don't own yet, still considering, but it's too tempting to overlook.