I wonder how much of the traditional music and theatre businesses has been money laundering. One could put out a record (which presumably has a nice margin on it) and pay folks a small amount of money to buy many many many copies of the records with cash, turning the dirty funds into clean ones. Likewise with a theatre production and ticket sales. Seems like any business with significant cash inputs would be vulnerable to this.

And of course it would make it very difficult for legitimate businesses to survive: they would lack the implicit subsidy that the illegitimate businesses get.