Don’t judge a book by its cover.
How many times have we heard this phrase and then totally ignore it.
An old client of mine used to run a shop selling carpets. A scruffy looking man appeared in his shop one day and was instantly judged to be a time-waster and was therefore generally ignored. After about thirty minutes of ignorance the man approached the salesman and enquired about carpets for his whole house. The whole house turned out to be a mansion and the scruffy individual turned out to be Midge Ure from Ultravox and Band Aid.
My advice, before you judge a customer based on how they look… take a good look at their shoes.