Very interesting idea in terms of keep tracking of the takers vs. the holders. I've thought about this for a while in terms of the exchange transfer reports I used to do. It could even been done as at an interface level so people would know how much someone extracts verses deposits in terms of value. Either way, though, I think it could be gamed and by that I mean separate accounts could be created and funds moved around so that some accounts have terrible reputation as they are only used for dumping value and other accounts are kept "clean" where deposits happen.