For those trying the mental sum for value of the mod, think of it like this:
There once was a factory, with a machine that made $50,000 an hour worth of product. This machine went out of balance. They called in a consulting engineer, who charged them $100,000.25. He ran a test, and put a chalk mark on a shaft, and told the mechanic to add 5 grams of weight right there. The machine worked like new. The whole thing took the engineer 30 minutes. When questioned on the rates, he said simply "$.25 for the chalk, $100,000. for knowing where to put the mark". Materials definitely do not cost $300, or $400 for the balanced pair. The extra allows Mr. Speakers to run a successful business bringing a wonderful headphone to the public. What justifies the cost above materials? Mr. Speakers knows where the chalk mark goes.
I'll add that the spread between materials and price for Mad Dogs is likely much smaller than for most headphones on the market.
Edited by aamefford - 7/16/13 at 8:26am