And who was it that told you appeal to authority was a fallacy? Some authority on fallacies like Wikipedia, maybe? :D

http://lesswrong.com/lw/aq2/fallacies_as_weak_bayesian_evide...

If a wealthy self-made person says something about how to make money, that's stronger Bayesian evidence for that actually being a good way to make money then if some random person says it.