I think there are three relasons why over 1 million people play minecraft... I'm sure this is not ccompletely true, but...
1. It completely open. You can do anything.
2. Its got a huge community. There arethousands of hardcore minecrafters out there. Mods are realeased by fans and developers alike.
3. Its a very innovative game, always receiving updates + upgrades, and you can generally find a mod to allow you to do anything
What's you're thought on these?