I really do not understand why he spends so much of the article talking about "class warfare" and the difference between "expensive" and "cheaper" things. The iPhone 4S and Galaxy Nexus ARE THE SAME PRICE.
Honestly, I haven't read enough from MG and Gruber to form a meaningful opinion on their argumentative style, so I'll digress from staking out a position. But I agree with Topolsky in theory, that is that an argumentative appeal to luxury isn't sufficient in itself, considering luxury can be decomposed and explained at a more concrete level.