Power
They say money is power, and as an investment banker your life is pretty much all money, all the time. So that makes you powerful right? Well, sort of.
First of all, you're one excruciatingly tiny cog in a massive machine. What, you thought they let the twenty-two-year-olds risk billions of dollars without a small country's worth of management oversight? Ha. Even if you want to make the case that you're a vital cog, and therefore account for at least some of the power being thrown around...you're still, at best, representing a client.
And while your work might make that client an all-powerful billionaire, it's not like he or she is going to turn to you for advice when they decide which presidential candidate to back or which third-world country to save from a natural disaster. Sorry, kid. At the end of the day, you may have the money, but you don't have the power.