With a flip flip here and a flip, flip there.... here a flip, there a flip... everywhere a flip flip....
Supply gets taken off of the market for these ETH holding companies without products. That increases the price of ETH and the potential returns for the ICO's plus a 'premium'.
It's a house of cards, especially considering ETH cannot handle it during ICO periods.
All it takes is a few weeks of bad ICO's or exuberant spikes for someone to shit the bed and dump a bunch.
Still a good buy though :P