Many of the people I know that work in the vast world of "other people's money" feel exactly the same way, FWIW - on many occasions I've had discussions with them about the fact that all the only value they ever create is to shave the odd basis point off a spread here or there, and they have no illusions that it matters one bit.
But it's an assload of easy money, and once you're in, it's trivially easy to stay in (it's like gambling for a living, where you get a cut of whatever you win, except that you don't actually have to win consistently to continue to buy in because there's always another fool willing to trust you with his money), so it's very easy to end up deciding that there's not enough rational incentive for you to do anything else.
More than anything, I weep for the brain drain that Wall Street inflicts on the rest of the world. Far too many of the smartest people I've ever known were sucked in, people who could otherwise be creating real value doing jobs without which, the financial industry couldn't even exist. IMO, this is the great danger of having a society where the money shufflers are outpaid by 10:1 compared to people of similar ability in other jobs, that too much of our real talent will be wasted on an industry that is practically by definition (as a zero-sum plus fees industry) incapable of creating much more value than it currently supplies.