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I think the key word here is "friend". If you know them well enough you should be able to determine whether the venture is lilkely to return $100 or $1m - maybe you are even in a position to discuss that with them.
Seems to me you've just about answered your own question.
You talk mainly about recognition - and an author credit would give you that. You also say you're not that interested in making a business out of it.
Why not ask for a nominal fee with as you suggest $50 or $100 and see how that goes
and...good luck with it, always exciting when someone wants to use your work (and properly credit you for it!)
niko
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