someone who does it occasionally and has a regular job. She does not depend on it for a major source of income.

For you it means that you do not have a professional attitude.

When I was an escort ( I am mostly retired now) some of my clients referred to me as a non pro...but I never got what it meant. Anyone who can shed some light on this?

It's a meaningless term that some escorts use to make you believe that they are low volume.  If a woman takes money for sex she is a pro.  Volume is irrelevant.

always doing it the same way.  Some providers are so coreographed in that they do the same routine with each client; kind of like 10 minutes kissing, 5 minutes sucking, and a quick fuck and then rush hime out the door.  

Next in line, come on in.