Time is in short supply, and fees eat away at my little pool of cash.
I'm willing to take the risk, and willing to put my money in the hands of people who are young, smart and innovative, instead of bureaucratic, slow and set in their ways.
Not only that, but if you'd checked, your cash will be FDIC insured through their partners. I certainly don't have a quarter of a million sitting around.
Finally, the way things are going now, the government is the only reason those "grave old men in suits" still have your money at all.