Disagree. High end work of all sorts isn't the sort of thing you punch in and out of. Both have a high opportunity cost, in that in both cases you'll find it hard to work a similarly compensated second job. Also remember this is only "billable hours".

Edit: I just realized you've completely missed my point. I was replying to a comment the clients (i.e. not the sex workers) are crazy rich. I was presenting an argument for why they aren't.