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There are many pieces of privacy software (and user cookie deletion) which will throw these stats off.
The percentage that it throws off your stats really depends on the industry your in. You'll see a higher percentage of cookie deletion from webmasters than from 'joe average'.
Overture's conversion tool, was a 3rd party tool from Keylime. It had major bugs, and was completely retooled over a six month period, before YSM ever released it. We have seen conversion skew as high as 30%....
We establish that +/- 10% is the acceptable range, due to cookie deletion and anomolies in the web space.