Warren, if you had bothered to ask, you would have learned that the conference is entirely funded out of Mr. Baron's $1 billion or so net worth. Yes, he made some of that billion from the fees he has charged to manage his shareholders' investments. However, the bulk of his wealth derived from his investment returns. While the cost of the annual shindig is obviously high, it pales in the context of $1 billion.
P.S. You may wish to pan Rod Stewart, but his record sales (and the enthusiastic standing ovation he received at the end of his set) tell a much different story. I do agree though that Ron Baron should let his long=term performance speak for itself since his speaking style leaves much to be desired.
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