Looks like I had my numbers wrong. Thanks for pointing that out.
at 0.3% average fees, they got over $7M of fees in a year.
Bitstamp's also a ripple gateway, so it also makes money selling ripples (XRP), and through trades and withdrawals from ripple's distributed exchange. I don't know how much they make from ripple, but it takes your total over $7M a year.
Yes.
And still a bit more I didn't include: deposit and withdrawal fees.
But again, they pay for servers, employees, electicity, taxes, etc.