I would guess most of Windows' revenue comes from selling with new PCs rather than upgrades.
It's mostly power users that that take the pain to upgrade OSes(risking breakage). Most regular users seem to think the upgrade is not worth the hassle of things breaking.
I've seen this attitude even in enterprises. The OS(and even Office) is almost never upgraded on the same machine, but if you get a new machine, it comes with the latest Windows and Office(provided it's compatible with the apps/network etc.).
It's mostly power users that that take the pain to upgrade OSes(risking breakage). Most regular users seem to think the upgrade is not worth the hassle of things breaking.
I've seen this attitude even in enterprises. The OS(and even Office) is almost never upgraded on the same machine, but if you get a new machine, it comes with the latest Windows and Office(provided it's compatible with the apps/network etc.).