The Mincome experiment (http://en.wikipedia.org/wiki/Mincome) dabbled with this idea and the results were rather surprising. Most people seemed to want to work rather than loaf around and collect benefits.
Don't think you'd have to "tax the rich like crazy". Would returning to the tax rates of the 1990s be "crazy"? Would closing corporate loopholes be "crazy"? Would investigating why trillions of dollars in tax havens have somehow escaped oversight be "crazy"?