My second week open at my high-end store (1974--South Florida) a young man walked in with no shoes, no shirt, cut-offs, and really long, stringy blonde hair.
Surfer, I thought, but hey, I was only open two weeks, so what the heck?
He bought the most expensive Audio Research and Magneplaners in the store, along with a Trinitron TV (remember them?) and a Thornes TT, SME arm, and Supex cartridge. He ordered a Nakamichi, which was not out yet.
He then went to his car and came in with a suitcase of cash.
SO, I learned very early that, one, never discount a customer over appearance, and two, NEVER ask a customer what they do for a living.
In those days in South Florida, and thoughout the 1980's, we had MANY cash transactions from people one may not think on first look could make those purchases.
Now, the man I sold the business to had two rules: treat customers like crap, and if they don't squeal at the price, double it.
Different strokes for different folks, I guess...