The discussion was about whether or not MS has decided to reduce their retail OS price from the ~$100 it is at right now. AFAICT, they have not.
This is still desirable compared to torrenting because a pirated copy will end up failing the Genuine check, will no longer get updates, and will happily be a part of some botnet some day.
That said my current machine is Win7 enterprise that I somehow, if only through brute force rather than actual know-how, managed to convince that its install had been validated.
This practice is actually fairly common. For example, almost all the technical people I know have bought OEM licenses rather than retail licenses for previous versions of Windows when they're building new systems. According to Microsoft, an OEM license is only valid if you sell the new system to someone else, not use it yourself[1].
[1]http://www.microsoft.com/oem/en/licensing/sblicensing/pages/...
I know plenty of people who would hate to torrent of, say, Photoshop, but also don't think it's worth $550 to them. Having a bought license that's legally of questionable origin is a compromise many non-business users would be more than willing to entertain.
What would be peoples motivation to buy it for existing computer?
* "It's sorta legal, it's at least some kind of a licence, right?" -- they're misinformed / tricked /fools
* "I want to pay something, but retail costs too much" -- if you pay without getting anything useful in return, you're donating. Why not donate to charity?
* "I want to get Windows Updates" -- cracked copies used to get updates, and they're often bundled with updates already applied
My point is, I don't understand buying half-valid licence. Licence is either valid or you have no licence.