I took the MRT 2 years ago, passed everything, but couldn't get the certificate because I didn't have a set of grommets with me. To be honest with you 2 years ago I was a TERRIBLE stringer and an awful salesman. I definitely didn't deserve the title of Master Racquet Technician.
Now I will most likely retake the exam before I graduate but Its only a piece of paper, I don't believe it signifies a true standard.
"I knit with fence wire for a living" .... its as exciting as it sounds.