It could be that pro-social behaviour is the expected norm. Even quite anti-social people still behave pro-socially or neutral most of the time, because it is generally the least costly. So there is more information gained from an anti-social act than a pro-social act generally.
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I made a reply to @timcliff about this and I think it is also an appropriate response to your comment.
https://steemit.com/reputation/@dantheman/monetizing-reputation#@neoncow/re-timcliff-re-dantheman-monetizing-reputation-20170416t045602781z