Not surprising since Microsoft never pulled the regular version of XP off the shelf. When faced with the decision of buying a labotimized version of XP vs the real deal, which would you buy?
(I already know a bunch of you would say neither, so you can stop right there

)
Microsoft knows that as soon as the real XP sells out that there will be nothing left to buy but the XP-N (N as in neutered) version, so I don't really see them losing out in the long run.