Earlier quoted context omitted.
Besides cost there is also risk- a transfer of this size in the light of day would raise a lot of questions- Where did this money come from? Was tax paid? And depending on the reason for the transaction regulators may interfere or freeze the funds.
Yes, because making sure someone isn't buying a nuke on the black market and is paying the taxes they owe is just terrible. Don't get me wrong, the regulatory framework for money transfers seems to suck, but I don't want to go from "shitty regulation" to "zero regulation", I want to go from "shitty regulation" to "smart regulation".
I'm tempted to conclude this is something that happens so rarely you may as well count the times it happens as a rounding error.
It's a bit like saying government will just work if we only vote for the right candidate.