How about Berkshire Hathaway itself?

http://www.businessinsider.com/warren-buffett-berkshire-hath...

You can think he got lucky 50 years in a row (1/2^50, what're the odds? Does it invalidate the null hypothesis?) or that investing involves an element of skill.

It's impossible to predict who will win a poker tournament but winning games is a skill, and certain players consistently do better than others. Sure, I wouldn't advocate the average person try to make money with poker, but it's disingenuous to pretend it's a black art.