you're talking to the worng person. Actually Blue is a pretty friendly chap who could give you the lowdown on the profitability or lack thereof of running a site.
What i
do know is that even the best and most professionally run sites are struggling to stay afloat even this long after the dot com meltdown.
Lastly, if server costs and bandwidth is an issue then file hosting is probably the last type of thing you should be doing. Try to offer a service that no one else is doing (don't ask me what, I'm a building contractor

)
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"Both the “left” and the “right” pretend they have the answer, but they are mere flippers on the same thalidomide baby, and the truth is that neither side has a clue."
- Jim Goad