I'm with Michael on this one. All my life I have had to take the butt of "Finger In The Ear" "Tankard swilling" jokes.
I know people in the advertising industry, and believe me, they are almost certainly out to take the piss, and re-inforce sterotypes. A plague on all their houses. Wouldn't touch them with a bargepole. and the money is immaterial.
Morris dancers/musicians don't do it for cash anyway....