[Leonardo]

But you are kind of missing the point. Preflop advantages are small most of the time. On the flop one is much more likely to be a larger favourite/underdog than preflop. You talk about giving people the odds to outdraw you, well I am talking about taking away those odds on the flop. If you keep the pot small preflop, then you are taking away peoples odds to call you on the flop, and then decisions on the flop become much more meaningful. The advantage comes because you make better flop decisions, which are more meaningful because of the smaller pot, and they make bad decisions because they are not as good as you and those decisions cost them more.
As for the bad finance analogy, I dont see how it is bad. It shows a simple case where having the option to wait and invest later with more information is valuable. In poker, limping is taking this option and waiting for the flop to bet/raise is the investing. If you can't see it then it is your lack of understanding, not mine.