A valid observation...
In my visit to Best Buy, one of the things I checked out on the Samsung Atom based Win 8 Pro device, the Surface RT 64gb and 32GB was the free drive space on C:
For exactly this reason. The 32GB Surface RT had 2.5GB free on the sales floor.
And I've argued that it is silly to buy an iPad Mini 16gb at their entry price when you can get a Nexus 7 with 32gb of memory and an unlocked mobile radio for $300.
So subjective value is becoming a differentiator in this market on multiple different levels.
Is the iOS experience so premium it is worth paying more for less than the competition? Is it just a commodity value proposition, or is there something more tangible there? Do these same arguments apply to Windows 7 devices?
If the Windows device is more productive, efficient, and enjoyable to use, maybe it is WORTH paying a premium and having an OS that takes 100 times the space.