Earlier quoted context omitted.
It's not just marketing, people always say that about Apple because they have good marketing, but they have good numbers too. The fact that they have less than 10% marketshare in PCs is not all that significant when you consider the massive numbers of PCs that are sold for all kinds of tasks where a Mac wouldn't even qualify. If you were to look at marketshare of home computer purchases it would be drastically higher…
There isn't really any useful information in your reply here. Apples "Consumer only" market share is still less than 20% and if you include Ipads..... as a PC replacement their market share is still only around 15% (though that data is a year old apple only had about 25% growth last year which makes it a wash in the over all market so those numbers are still pretty truthy-ish) http://www.theverge.com/2012/1/14/270629…
PC market share as defined by analysts is reflective of the market that Microsoft is pursuing, but it is a large superset of the market Apple is pursuing.
You say this is silly to point out, but you're leaning on circular logic. You take "the market" as a given a priori, but the truth is that the market is defined a certain way, and that way is very unfavorable to Apple (and that's without even getting into the whole profit share vs market share question).