I'd rather think of different purposes of money
1. License to violence, by applying some power of emitent
2. Foodstamps
3. A tool to form a capital
4. A tool to form a treasure
5. An instrument of comparing valuable possessions
6. An instrument of estimation of consumption of resources during some technological process
7. A regulator of social activities
8. ...I forgot :)
What purposes could be covered by reputation currencies? Can we achieve something better than 2+5+7 ?