In IT, of course...
And one thing I've learned is that financial firms generally speaking, don't beat the market. If you look at the S&P 500 as a baseline index for the health of the economy (and it might not be perfect, but it's a good measure), 80% of firms CANNOT beat the S&P in the same timeframe. If the S&P loses, those private firms lose too.
And even if they did... maybe 1-2% over? Which you won't get, because that's what they charge in FEES to manage their funds.
So basically HFT exists, because people still have the idea that investing with Morgan Stanley or somebody is a great idea, and so MS have a huge amount of equity to derive ridiculous profits on for who else -- themselves. Add to that the fees they charge to manage the funds they offer, and the marginal rates of return that investors get well... you know how it goes.
Hopefully my job interviews pending will pan out and I'll get out of finance for good; but sadly the money is what has kept me there, especially with the student loans... yet another benefit from our wonderful financial industry.