Over the years I have been involved in a few insurer studies regarding the cost of mistakes. The most obvious, to an underwriter, is the cost of re-issuing policy documents processed in error. No one publishes these statistics (too embarrassing), but I am sure that almost every insurance company, at one time or other, has done similar studies and or tracks these mistakes as a KPI.
http://www.insblogs.com/legal/reducing-error-ratios-underwriting-compliance-cost-reduction/3323