The fact remains, no trader has ever managed a consistent 30% a year over a career with very low standard deviation.
The ones that have annualized returns over 30% a year did so because they had short bursts of amazing returns, mixed in with the vast majority of years being less than 30% a year.
So your Zanger example is a good one. Yes of course his annualized returns are way higher than 30% a year over his career, but it's the result of what he himself calls a perfect storm that will never repeat itself. The standard deviation of his returns are off the charts high.
All honest traders who have higher than 30% annualized returns over their career say the same thing. It was mostly from a few good years because of a perfect storm of success in a short period.
I'm way higher than 30% annualized, more than double in fact over the last 10 years, but I'd be lying if I didn't say 2009-2012 helped. And as a volatility trader I don't think that sweet spot of perfect volatility trade set ups will ever repeat itself.
At 20% a year, everybody, even a Janitor saving 300 bucks a month will retire a millionaire. Don't plan your career around a perfect storm lucky streak my young inexperienced friend, plan it around REALITY, and if you happen to get a one in a million lucky streak, all the better.
But if you withdraw money every month to live on, even from a fund that's killing it at 20% a year like clockwork, you'll go broke in no time at all.