And there risk is higher than 'surefire' :-) I've invested in, been part of, and advised startups so I understand those risks. And, for example when FB stock dropped to 17 I bought a chunk and put a limit order to sell it at $28 (I ended up getting it at 18 and my limit order was purchase + $10) But again, it was a lot riskier than "surefire". When people guarantee results without risk, that is when I say "oh really? and just how do you do that?"

There are lots of ideas, but the tried and true one is 'Ponzi Scheme' :-)