"You" probably don't, but it's not just "you". There's also the counterparty who's asking to see that report. Maybe they're doing it for paper-pushing purposes of their own, but ultimately, somewhere up the chain, there's someone thinking "I can't personally audit all my suppliers, and I can't be sure they're doing the right thing, so I'm going to ask them to get an independent audit".

Of course, this shows that the entire system is a bit of a charade, but the point is that someone cares and they're gonna be annoyed when they find out that the audit appears to be a sham.

Whether they have a good alternative is a separate question. But here's another way to look at it: if we show blatant disregard for self-regulation, the government is eventually going to show up and come up with more onerous rules.