I co-own a lot smaller company, so it was more in a range of 4 figures (euros), but more than once I've been in a situation where I've just signed a deal for some business with some company, called one of the 'hardware guys' from the car (external companies that eg. import hardware, are distributers for lenovo/dell, whatever), got an offer for a set of hardware that we needed (a few servers, etc.), forwarded the email to our ceo, called him (without faked AI voice in my case... for now), told him "pay this today, so we can get them by the end of the month", and he did.

If someone knew I was negotiating some business that day, phished an email with whatever account number he wanted and AI faked my voice, he'd get the money transfered.

So yeah... another thing to worry about.