I have my doubts on whether Baupost has really outperformed over time.
I think Seth is a marketing genius though. For instance, I don't believe he himself has ever said he has outperformed the market but, somehow, such image has been built slowly over the years.
I remember an interview for example where he implied it was a conscious decision not to re-publish his book "Margin of Safety" since it had a cult-like following and had been a good marketing tool. Also, the secrecy behind the annual letters, the "leaks" that happen from time to time, going after websites which publish the letter, has created this aura of mystery and genius. Every interview starts with "Legendary Investor" but, again, he's never claiming that but the interviewer on CNBC.
I would love to be proven wrong if his annual performance numbers were ever revealed.
As with other investor who are, wrongly, seen as investor gurus, the only reason it bothers me is because it dupes people into investing with them for the wrong reasons.