Think at all those hundreds of ICOs which have raised millions of dollars worth of ETH each. Some of them, like the scammish Envion, even 100M$.
Now in this bear market they see their wealth evaporate. They need FIAT since they are real world projects and they need FIAT to pay for infrastructures.
So they cannot simply watch at all those millions $ EVAPORATE and jeopardizing their projects.
It is true they have raised Millions $ but now those millions $ are shrinking further and further and so I guess THEY are panic selling and crashing the price.
What do you think?
I think that scammers are not fools. And they won't sell the Ethereum 90$ (price 14.12.2018). I think that they will wait until ETH grows to 1000+$.