I keep wondering the same thing.. When are they gonna come and buy some?? Because when they do everything will go apesh!t.. with blood and paper money flying on the walls. The exchanges will go absolutely bonkers!
Vertical will be the way! Trying to flush out coins from all corners of the world with a higher, higher and higher price for each coin from those that hodl so they can regain control of the manipulation.

big money does not get big by going on an exchange and buying everything with two hands.
it buys otc, but only after crashing the market to the best of its ability.
OTC transactions are 10% - 20% more expensive than the exchange ones! And also... I think they would create their own exchanges, that are in their own will of command!

OTC is much more than "localbitcoins". Big players buy and sell OTC in huge quantities (1000-10.000+) and arrange whatever price they both are willing to accept, usually with a negotiation, it may be higher or lower than exchanges price depending on many factors.
Also, try to buy 10.000BTC on any exchange and you will see where the price goes...