Whoa! 2,000,000 Raspberry Pis sold and growing!!! I mean sure they're useful... but not that useful!!! Now I don't know much about bitcoin mining but I'm assuming that it is a lot like gold mining. So all I have to say is that I am sure for every bitcoin found by a raspberry pi, I'm sure that it wastes a bunch of resources and time to make up for the money spent on the robot that the RPi company makes out of raspberry pis and spare or leftover components and scrap metal. they are probably losing more money than they are earning from the bitcoin mining. Because a robot, no matter it's function, is usually very expensive due to the fact that it is a robot. I'm sure each one of the RPi bots cost about 3 grand. That's why only mining industries can purchase them.