How to design a karma reward system
anamax: > I would like to introduce a 'karma reward system' in order to a) motivate people to contributeWhat evidence do you have that any karma system motivates people to contribute the kind of content that you want?Seriously - look at the top karma people on HN.  What fraction of them post for karma?  Of the ones who do, how many of them do you want?> and b) to crowdsource ratings both for people as well as content.Again - what evidence do you have that karma helps with this?A karma system guarantees that you'll have people posting for karma and discussing it.  Both are bad.  What benefits that you can reasonably expect that are more valuable?