'You get what you pay for' is BS in most cases, and is definitely crap in this one.
Were US built cars better than Japanese cars back when they were more expensive and had worse reliability and milage? They must have been, because 'You get what you pay for'.
Chromed out Dubs on a donk must be better than stock, because they're more expensive and 'You get what you pay for'.
I'm not an AMD fan, or an Intel fan for that matter, but to claim that Intel CPUs are better because they're more expensive just doesn't make sense.
On the very high end, Intel's current Nehalem based chips have better performance in an array of Apps, but are selling for far higher prices.
Back when the original Athlon came out, AMD chips were both faster and cheaper than what Intel had on the market.
So why were Intel chips still the bigger seller? The FTC had the same question and is currently suing Intel over unfair business practices.