Or spending money on other bullshit toys. Before he burnt out hard and got canceled by the alphabet mafia, Notch was giving off serious Ion Storm era John Romero vibes:
https://photo.rukes.com/notch/notch.html

Imagine what could have happened if he was smart and invested it all or done something else like fund parallel structures to AAA instead of throwing money at shit like the Ouya to have his name on the early consoles.