plus, its more then just moping and sanitizing....some places need a little mold remediation done, equipment be left at different locations like fans and such, chemicals, the overhead bills.
i know we look at it like i couldn't see paying all that but the insurance to do this kind of work is very expensive due to the risk of things such as mold and injury.
i used to own a crime scene clean up company, and let me tell you, it was kind of like the insurance company would hand you a blank check and say write down any dollar amount you want here and we will pay it ( with in reason).