I don't think it is luck. Most CTAs are suffering draw-down during the same period. It cannot be that coincidental that most participants are suffering bad luck at the same time. Something fundamental has changed in the market that has affected the industry. CTA trading strategy is no longer working well since 2009. It remains to be seen if they can recover in future.
Check out the CRB index. It had a STRONG upside bias 2001-2008. Easy to conclude that successful CTAs also had a long bias... which was correct for the time. Since 2008 peak, commodities have had a strong down bias. If CTAs were prone to still having a long bias (not because they couldn't read a chart but because it's "part of their DNA" as it is for most market players), they would struggle.
IOW... the markets' long-side bias hit the CTAs' long side-bias... and VIOLA! Success. But when the market's bias shifted to negative, the CTAs were still trying to BTFD and always give the benefit of the doubt to the long side..
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