When you buy a car, they advertise the MPG, that it won't rust for 20 years and of course, the price. How many guys did you see complaining that they bought a Mustang and they can't drive with a speed of 10 miles per hour and obtain the advertised MPG rate? How many of those guys did you see whining to FORD about compensation in price, because their product does not meet the specifications? How many guys are complaining that their car does not reach the 180MPH printed on the dashboard? They bought the Mustang, and they're free to return it or resell it.
Why would be the mining business different? Or any business for that matter? Everything changes when you reach understanding ..
What a stupid analogy. When a car manufacturer advertises 20 MPG, you can reach it by driving appropriately, and in fact you can exceed it quite easily. See
http://en.wikipedia.org/wiki/Energy-efficient_driving for examples.
Now, show me how you get an SP30 to run at 5.5 TH/s while drawing 2700 watts?
I agree that it was a bad analogy. Miner (especially hosted miner) has no other utility than making BTC while car has a utility of getting you from point A to point B.