Even assuming accuracy as a given, nobody is perfect and mistakes can happen.  I would also include "potential liability" as a factor.  Perhaps you could include that as a part of "overhead," but I see that a separate issue.  Libaility should be factored into pricing, but I find that it is often overlooked.

It is also hard to factor in the time.  If you are just looking at the time it takes to complete a search - maybe you would be okay with a lower fee.  However, that would assume that you have enough current owner searches to keep you busy all day, every day.  And, that used to be the norm around here - but rarely is it anymore.   And, that is the next thing you are missing in your equation - PROFIT.  You have to be able to make enough profit when you have work to balance out the slow times when you don't. 

Best,
Robert A. Franco
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