Well, above I mentioned my friend in MA who bought a house with his earnings from CL and then BP, no other sources.
I know his life wall to wall, inside out. We would live together in his then apartment in South Boston for days and days on end. I know his family, and his best friends. He didn't hide anything from me; that was just not in his nature as a person. We both went way beyond the usual barriers -- and with entirely positive outcomes for both of us. We each gave the other some precious and needed human things that others in our lives weren't offering us at the time.
(If you just can't believe a professional relationship can healthily exist in parallel with a genuine human one, you have my sorrow.)
He would even show me, with deserved pride, his bank accounts and how his escort earnings were growing and accelerating, as he practiced, and refined with experience, his travel routes and schedules.
So I know beyond any doubt that his sex work through CL and then BP ads was his sole source of income.