Profit per phone vs volume sold for mobile handset manufacturers

Full context here (which still doesn't explain the time period depicted in the linked chart): http://www.asymco.com/2011/02/02/making-it-up-in-volume-how-...

Do they intentionally mix smartphone and non-smartphone sales to make some kind of point? Seems a bit misleading otherwise.

If they dropped all the feature phones from Samsung and Nokia etc. I'd guess the graphs would look a lot more similar since they'll be selling much less and at a much higher average price.