It's incredibly easy to pump a coin when you control the great majority of the total supply.
So why couldn't the SDC whales pump SDC then?
Perhaps they are fools, are disorganized, or perhaps they don't quite control quite enough of it. Or all of the above.
EDIT: Or maybe they are indeed successfully pumping it and their fair value would be more like $1 than $300K. A factor of 300000 from manipulation is nothing to sneeze at.