top marketing gurus and their "valuable" info

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does anyone really pay those so-called marketing gurus ? i.e. pay them for their info, whereby, they claim to earn big, big money via adsense or otherwise! some only require $10 or even less. it seems to me if they were truly earning the huge amounts, LEGITIMATELY, they'd focus their time on maximizing the ROI. Instead of trying to sell their so-called, " secret " info. And, why would they sell the big money "secrets" for "only" $10 - $100 ?? i.e. if those tips and secrets have emmense "value" it seems they would guard those secrets, closely. Basically, i'v thought of buying into some of those, but what if their so-called secrets is only stuff i already know !?? Money-back Guarantees are NOT good enough, i have better solutions they could use. But then i'm trying to sell my own info and ideas "TO" those gurus, and that entire industry ! And so the same issues i described (and more), apply to ME, TOO ! i'm so confused. do you share the same or similar confusion !?