I don't think the miners are dumping nearly as much as the masternode owners.  Masterenode owners essentially get free money every month and have a huge incentive to dump as the value keeps droppping.  A miner has to cover their electric and get scraps after all said and done.  But ya lets blame the miners are usual.  And so it goes.

Keep dumping masternode owners. I hope you get a higher reward so you can surpress down the price more and I can buy more cheaper