Ongoing study “eBay user feedback abusive users”

A little on going study which I will soon be publishing the results of, recently I noticed something a little odd 80%-90% of the time when a seller gets a negative feedback I found it to be left by a relatively new eBay users. Looking into this a bit more I found that the majority of accounts who were leaving bad feedback were registered in 2011 & 2012. I believe there’s some kind of connection there, I think that either new buyers don’t really understand eBay’s feedback and the problems it can cause a seller, or there old sellers who were screwed by the system so are striking back. Older eBay accounts were much more likely to not leave any feedback at all.