Actually, I think this is a problem that is not Tablet specific. It’s a broader issue both in terms of customer support and in-the-box supplies. Where the issue gets extra difficult for the Tablet PC market is that you can’t just pick up the Tablet PC OS anywhere–outside of an MSDN subscription and even that doesn’t get you everything you need.
I only wish I had a Tablet PC OS license to give away. I would in a heartbeat.