Metaluna mutant
Sr Member
Dave Filoni has addressed this and shared what George told him about this very subject. The Sith are obsessed with living with their power. They selfishly cling to it and they try and prolong their lives to make it last. The Jedi are selfless and willing give themselves to the Force, and death if necessary. The Bane vision in Clone Wars really wasn't a Force ghost.
Wow. Neat to hear this -- for once my head canon actually matched reality!