Earlier quoted context omitted.
> They often like to be paid in cash, at least for the first visit or two, so everyone immediately knows it's all above board. Paying people in cash seems like the exact opposite of an indicator of everything being above board.
Not really. It's in your hand, right now. It can't be disputed later and retrospectively yanked back out of your bank account, or not paid out to you in the first place if you use an intermediary payment service. These are not hypothetical problems. It's also a traditional sign of honesty, and a convenient way for someone who has provided very good service to be tipped without making a big deal of it ("Keep the chang…
Well I accept your experience, but in my experience asking for cash is a traditional sign of dishonesty and tax evasion. Why do you think they always offer a hushed discount for cash?
A professional tradesman invoices after and then accepts a bank transfer. Asking for a wad of banknotes is grubby.