[citation][nom]marcolorenzo[/nom]yeeaahhh...combining the mobile platform market with the standard PC/Mac market...that's really fair. It's like saying that bicycles have a bigger market share than cars (of course, probably not in the U.S but in Europe and Asia, that would be quite likely).[/citation]
A PC used to cost less than a Mac and brought only a tiny fraction of the revenue per unit, but PC/Apple market share comparison was made since the beginning of time.
And Netbooks were counted as PCs even if usually sold at less than half the price of an entry level PC (and less or equal to entry level smartphones!)
Comparing market share is comparing market share, not volume or revenue, so it makes sense as ONE of the business metrics.
In this case, mobile devices has prices comparable to low end of PC offer, not something completely unrelated in price like bicycles vs cars.
What is more interesting is that now anyone including MS with VistaBob 8 Squarepants, is expecting to squeeze money from the web services (say advertising, say adware-based Stores, say built in adware in browser's search and desktop/metro entries), so a low end device might even (BE EXPECTED TO) generate more revenue per unit than an high end workstation expected to do real work instead of browsing or using Apps...
Time will say what business plan is better, but sticking on the news comparing market share is a perfectly legitimate metric to take in account by itself when looking at the IT trends.