Lesson I learned years ago. I used to deliver milk when I was a kid and we'd go round collecting the money on a Friday night. In the nice estates with the big posh houses you earned very little in tips, I remember once a well known local millionaire waiting for me to run about 100yds to the van and back in the pissin rain for . On the council estates, and in houses that looked as though they needed every penny they had, you'd do much better. Much friendlier folk too, who'd often tell me to 'just keep the change son'.
I guess you don't get rich by giving your money away..., but keeping it all