This is just speculation but it might well actually be happening.
As new money is being prepared by hedge funds they don't want to pay the prices Bitcoin is heading to. The very first money is definately in already - we know that. So someone might be trying to hold things steady with a wall.
But how long can they hold out against the persistent swell of interest?
Thoughts...
If a large fund is looking to take a long term position in Bitcoin will the fund managers be most likey to:
a) Enter the market Honest John style, buying the dips but with their large purchasing power invariably pushing the price increasingly higher, causing sell-off events that enriches Joe Public at the funds short term epxense.
b) Use their present Bitcoin position to facilitate a panic selling price crash, perhaps timing their dump to hit a low volume market on a bad news day, but culminating in them scooping up large volumes of cut price coins.
c) None of the above. Large funds won't seek to take a mammoth Bitcoin position via the exchanges, but rather arrange an OTC style private transaction(s).