Having no idea what these fees are for, I figured the next step is to ask why they charge these fees. That way I can give some sort of reasonable answer on what I'd pay. Here's my resonse:
Dear Mr. Mahon,
As I mentioned in my previous e-mail, this is my first FOIA request, So, if I may, I'd like to ask the purpose of the fees. Are they to cover mailing costs? Will I be actually paying the salary of the person looking up the information? Are they arbitrary fees designed to prevent "fishing expeditions? The reason I ask is so that I can provide you with an answer that is sensible for the purpose of the fees. If possible, providing an "average fee" for obtaining one document would be useful.
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The Government Way
FOIA Request Filed With NASA