Why is machine doubling not worth much?

I seem to find a lot of 1994 and 1997 quarters that have minor to severe doubling in the words IN GOD WE TRUST are the ones with major doubling worth anything? It's still an error no?

 

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Warning! Old thread!

Machine doubling, also known as mechanical doubling or strike doubling, is accidental damage. It is caused when the die becomes loose in the collar holding it. The vibration of the machinery causes the die to move back and forth rapidly, and when it withdraws after striking the planchet, it scrapes the surface producing the flat, shelf-like machine doubling. It is very common and adds no value to the coin.

Chris

 

simply put, because it is not consistently repeatable AND it's the result of a machine that is out of calibration.