Or, from another field: it might look like some stock investors are "hot" or "cold", but that doesn't mean that investing with a currently-"hot" investor will give you any better odds. The variance in the market is high; sometimes people get a streak of wins without that being any more than luck.

(Some people, like Warren Buffet, do more; but if you know enough about their strategies to differentiate between the people getting lucky and the people "playing smart", you know enough to do your investing yourself.)