People with high disposable incomes don't seem to have any problem owning a PC/Mac desktop , a laptop , a tablet , a smartphone as well as several games consoles and other gadgets. Assuming you already have an iPad I don't see any huge benefit to having a Windows 8 laptop over a Windows 7 one.
I know people who bought touchscreen monitors to run Windows 7, in combination to keyboard and mice. They found these a novelty for the first few days but they never really use the touch functionality.
That's a very mistaken assumption for Windows 8 devices. There are going to be a lot of form factors with touch which are not small.
Eg. IdeaPad Yoga.
http://www.youtube.com/watch?v=5SHKFYngqOM
Acer All in One http://www.engadget.com/2012/06/03/acer-announces-windows-8-...
Even an 80 inch computer. http://www.idownloadblog.com/2012/05/25/microsoft-sell-80-in...
Eventually you forget that your PC has a touchscreen. Even when you do remember that you can just jab something with your finger, your internal context-switching brain-lobe-thing tells you to not bother because the next few micro-tasks will involve the keyboard and mouse anyway.
I can't imagine buying a touch device for work. I wouldn't object to getting one to watch movies or read books on.