btw, people "dumping" in the last few weeks are in general not "people that need the money", they are scared "investors", thinking the price is falling to the floor and their dream of "getting rich quick" is in ruins.
Personally, and being really harsh, these are chumpsters and the bitcoin economy is better off without them.
How do you know who sells BTC?
The main activity in the BTC-economy atm is developing and mass producing of ASICs. Many millions of fiat are necessary for this activity and any price is ok when one really needs the other side of te trade. As a result market prices moves fast. And then other market participants, including the competing producers are going to run to the exit. If this is the case, then it is the miners' dream of "getting rich quick" which crashes (prices).