Macs might not add up to much in terms of PC market share as Macs make up only 14% of total PCs sold but add in the iPhones and iPads and that number is dramatic. As a company, Apple has surpassed PC market sales with its Macs as well as its iDevices and this means more new users are opting to go with mobile devices than with new PCs. Research from Analyst Benedict Evans points to another observation, "this is a pretty good illustration of the scale of mobile: Apple limits itself only to the high end of the mobile market but still sells more units than the whole PC industry."
Source: AppleInsider