Hardly surprising. Their customer base isn't made up of the few tenths of a percent (at most) of techies who "hate Microsoft" and are willing to put up with the troubles Linux gives (like not being able to run Windows software, for most users especially MS Office and games).

Interestingly, Wal-Mart is to continue selling Linux via the web just not in retail units. It also appears that the Linux PCs did all sell out in the retail units, but demand was obviously not as high as amongst the online crowd.