You're right, it isn't true. I said the rest of the industry was about 40%. That implies Apple is making 60% of the profit, or near. Also, I read somewhere that their Mac profit margins were 19, not 40. Then we move to the idea that people will stop buying them. That could be happening, or sales could be lowering because they haven't updated them.
Either way, I'm sure you'll have another reason why Apple should be shooting to make about 15$ profit per computer as was the average.
http://bgr.com/2014/01/10/pc-profits-analysis-margins/
THAT'S a scary article! :0