"It’s not about the money. It’s about my sanity." The full whys from Notch himself. Summation. ..it got too big and the fans scared him off. Can not say I disagree with him. I also loved this bit …." If I ever accidentally make something that seems to gain traction, I’ll probably abandon it immediately." That right there says all you need to know about fandom and the creative venture. 
The home of Notch