Visitant said:

Maybe George doesn't even care anymore. ;P

I read something a while ago, I don't remember where or who wrote it, but Lucas considered walking away from the deal because Disney wouldn't pay unless the got everything from Lucas, and Lucas eventually agreed because he didn't want to hoard anything anymore or something along those lines. So it is possible (maybe even probable) that Lucas selling Star Wars was his way of letting go of all the emotional trauma that Star Wars apparently inflicted on him, and letting some one else do with it whatever they please.