Well, it depends a bit on your upload speed, I guess......
I've got a 1Mb down and 512 Kb up adsl connection.
I allow 5 slots and 1 upload per person, which should in theory give each uploader around 10-12 KB to get a file from me (correct me if I'm wrong).
Since I'm sharing mostly video files, I guess, that is a fair share.....

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"Never Argue With An Idiot. They Will Drag You Down To Their Level, Then Beat You With Experience"

Also remember unless it's a rare file they are probably d/ling from more than 1 host. So even if they are only getting say 3 KBs from you they might be getting more from someone else.

I allow about 30KBs up with 10 upload slots 2 per person. Sometimes I'll try to help someone out and max out my upload bandwidth(about 46KBs). It's up to you.

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If it ain't broke, fix it till it is!