I'm just looking at the Sell Orders on Poloniex and notice regular 50 Ethereum orders spaced evenly out (I couldnt time it to get a pic of multiple 50s).
So why the sudden selling? Theory of many including Cliff High is that after big ICOs asking for ethereum like Paytoken, Veritaseum and others since, the ICOs themselves sell the ethereum theyve exchanged for their tokens. Why well they need the money to do what they promised in their whitepapers.
So as soon as you see popular ICOs taking place its good to get out a few hours earlier out of Ethereum and buy up after their selling; as Ethereum pops back up. However you need to keep an eye out of when the next ICO dump is coming. And to do this go to https://www.coinschedule.com or
Those 2 sites give you time to prepare so you can gain from an ethereum dump and profit by buying low and selling high.
Source of image: www.cryptocompare.com (ehtereum)