Looking on a daily basis I would say it's all about rocking the boat. And I would say it's pretty obvious why. You pump one side then the other in order to dump and shift into fiat or other crypto currency. After such a bullish run since November there were these shifts from "foundation" coins (BTC, ETH, LTC, ...) to different altcoins an back. There is more interest in having a highly volatile market in order to have mainly fiat gains (or buying altcoins cheap) that to really hodl.