What?! Your considering the market share of windows 8.1 against Windows itself and not the entire market???
Reality check - even though windows 8.x was deemed a failure, still has more users than OSX.
Apple would like to have as many users as windows 8.1 - more computers sold.
http://www.tekrevue.com/windows-8-outpaces-os-x-mavericks/
I wonder how many installations of Windows 8 run an Apple hardware...