What I wonder, with these multiple hundred coin dumps: Where do they get them from? Do they print them? 

24 * 6 * 25 = 3,600 new coins mined everyday. Miners sell them to pay bills (electricity, miners..).
This. For most people its a near break even or losing game for them with the current difficulty. This of course includes initial hardware, upgrades, electricity, etc. They -have- to sell.
No we don't.