"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.

Probably not, in fact your auditors not being terribly thorough might be a selling point. But your clients, who are the ones asking for the box to be checked, might.

In my experience, clients don't dig deeply into the report or the auditor, they just want to see that you 1) have the report 2) it doesn’t have any egregious exceptions. Perhaps if this makes big enough news, that’ll change.

As the company? No. In fact, it's likely better for you if they do a bad job. You potentially get shielded from blame, but don't actually have to put in the work.

As a user/customer/potential victim? Yeah, you do.