Not entirely, because you have to look at the "purpose" of a graph that displays market share, what if it included the iPod Touch as a "computer?"
They can't include the iTouch as a "computer" because it is not a free-standing unit (it relies on another "computer") and the iTouch does not run a full-fledged OS - it runs a much watered-down version. A netbook does not rely on another computer for syncing or any other use. And netbooks run the same OS as a desktop. For basic use, a netbook is no different than a desktop.
For instance, say you sell 10 million computers a year, but are barely making any money off them (i.e. netbooks). How do you increases you profits for the next year? Sell more units? or increase the price (as a new model)?
I'm sure ASUS is not complaining about a 50% increase in sales. I'm 100% positive that they are not "barely making any money off them." And yes, they do increase profits by selling a new model in subsequent years. It is a lot easier for a consumer to economically justfy replacing a $299 device every 1-2 years than a $1500 device every 1-2 years.