While I concur to the premise, I must disagree with the drawn conclusion.

At the risk of speculating, I'd say MS need some more time before the release the commercial license, for the reasons mentioned by you (robustness of the code, staffing tech support etc.) and also to possibly see the reception of the software by the developer community, before deciding on commercial terms (It IS labelled beta afterall).

Edit - From http://research.microsoft.com/en-us/um/redmond/projects/kine...

> "This SDK is designed for non-commercial purposes only; a commercial version is expected to be available at a later date."