Not true. Markus Persson (Aka. Notch) is probably just so stressed because of his company and the feedback he is getting. Those tweets doesn't tell anything about the real thing, he wouldn't sell minecraft just like that. At the minecraft.net he tell about how the minecraft started and how mincraft was planned for the future. He said that he will consider selling minecraft if people wont buy the game anymore. (May be in different words) But at the moment people are buying minecraft even more that before. Im not saying that it cannot happen, but it just wont be that easy Markus Persson to sell minecraft.