I wonder if it isn't a situation similar to their slow speed in getting the international interfaces for android market off the ground: that is, for-pay "Apps" are simply not aligned with Google's preferences or best-interests.

They would, I'd imagine, very much like the idea of for-pay apps to simply go away. Not only do for-pay apps threaten the money-train that Google's advertising network has built, but they threaten the relevance of search itself, should more and more data disappear behind proprietary interfaces.

So what motivation does Google really have, to throw resources at the problems facing paid-app economics?

(edit: spelling)