What are you on about?
Your "£320,000 to upgrade applications to work on Windows 8 yet they run perfectly fine in Windows 7" comment. Did you just imagine this figure and use it as a reason to stick with Windows 7 or do you actually know of an organization or business with this dilemma.
Even if this is true, then as an anecdote it proves nothing, for example has this business contacted Microsoft to see if an application shim can be created to make it run, heck Microsoft might even release a hotfix if this business is a big customer of Microsoft. How much is this application earning the business? If it is earning them billions of pounds, then £320,000 isn't very expensive.
Like I say I think we've got into hypothetical land with this. Surely most home users just want to create documents and browse the web, Windows 8 doesn't have compatibility issues with that as far as I know.
Zen 8000 Pro