They give it away.

Microsoft will never get this WGA or DRM key thing right, it's not in their interest. Sure they what to sell you Windows.. Sure they want to tax you on your new PC. Ultimately they want MS Windows running on your PC whether or not it's a genuine copy. Think of the massive discounts they give to OEMs to keep windows on the desktop. Think of the massive discounts that they gave to governmental departments when the latter were thinking of switching to Linux.. Market share counts for too much.

I'm a PC, I'm. a Mac, I'm a Slacker.