Sure, but the point is that the same things; knowledge, capital and an appropriate risk tolerance, are required for just about any investment alternative, same as the market; same as real estate, etc. Risk levels equate to return, more risk usually means more return; capital and risk tolerance are the other two important variables in any of these undertakings. When all three are optimized there is usually a better than average chance of "making some money".
"Knowledge" is overrated in investing. Paulsen was a genius betting against subprime and made billions, and now he is just another sucker that lost his shirt with gold bets gone south. If you win, this does not imply you know what you are doing.