Go for it!
Why stop at $20? Make it $50/hour! Then everyone could be above average.
That's what I always tell 'em. Any time a liberal brings up raising the minimum wage, I tell them that if they really want to help, then make it $50/hr. I then sit back and watch the look on their faces. They know deep down that there has to be something wrong with that, but they can't figure out what it is.