It is very easy to take the price of STEEM down.

Just go to Binance and see how little the amount is you need to "move" the market.

You only need to buy a few Steem at a low bid price time and time again and price goes down by itself :-P

Same in upwards direction.

Possibly the big Steemit Witnesses and Steem holders are playing this game so they can buy in cheap at the bottom they have agreed amongst each other.