Perform for free?

I was offered a chance yesterday to do my show for free at work. The person offering suggested that since I was so good at it the store would benefit in the long run if I would do the orientation for him. The fact that it would free him up to sell more cars of course never entered his head. He seemed offended that I refused. I was obviously not doing anything "productive" at the time, and even a half-assed quickie would be better than he would do.

It seems that he and the big boss don't understand that unpaid professional activities are not a reasonable expectation for a minimum wage flunkie.