Gamers on the whole will move anywhere and pay anything if...
...if it gives them an extra 10fps.
That's the real enthusiasts and if you get them to move then so will a large portion of the gaming community.
Remember these are the people that will spend a week tweaking their RAM settings to get their FPS from 134fps to 134.6fps. If they will pay £600 every 8 months for new graphics cards then £80 for a new copy of Windows every three years is no hardship.
8/8.1 is still evolving and being tweaked for performance improvements. Windows 7 in comparison, while a fine OS is a dead stick. That's not getting gaming performance love any time soon.