Take it from someone who has seen forensic auditors go through their workplace... It costs a f**king bomb.
It's so expensive because your year end auditors are generally only looking at the last 12 months. Forensic auditors are checking and re-checking information over a period of years. Plus, when you have a year end audit, you usually only see the lead auditor for an hour or so on the first day, then they piss off and leave you with a bunch of kids who've only just finished Uni. These guys are charged out at a lower rate then the lead auditors. With a forensic audit you only get lead auditors and they charge at a higher rate.
From memory it was roughly two and a half to three times the cost of a regular year end audit. Not only that but it sucks up your companies resources like nothing else. First you have to spend weeks gathering all the information the auditors request and then you lose key individuals for hours, sometimes days at a time as they're locked in an office with the auditors answering questions and helping them to understand what they are looking at.
It's probably the worst experience you can go through in an office environment.
You honestly would not make someone go through one unless they absolutely have to.
If every team in the competition was made to go through one of these, I have no doubt the competition would grind to a halt.
