I wonder how much of the anecdata being relayed here is a result of selective perception? We don't really remember the cases where a freeloading customer went

I wonder how much of the anecdata being relayed here is a result of selective perception? We don't really remember the cases where a freeloading customer went away at the first "no", or where a well-paying customer received the red carpet service treatment. The high-maintenance cheapskates stick out in mind because they're the exceptions, but perhaps they're not quite so common as they might seem.