I have no idea about percentage, but with the number of people I know to be card doctors, and the number of years they have been doing it, and some sense of how many cards they work on, it adds up.
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Net 54-- the discussion board where people resent discussions. 
My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
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