Yeah, I think that 20th Century Fox realized he was the reason the original was such a hit and let him buy all the rights to Star Wars properties to do with them as he wishes, or least that's what I can figure happened. It was 20th Century Fox that owned SW before Lucas did. through Star Wars Lacus was able to start his own filmmaking business and capitalized big time as a producer over the years. Too bad his actual writing and directing skills (meager as they were to begin with) wasted away doing that, though.
I know those last remarks sound like insult, but they're not. I'm just saying that Lucas made a good, fun movie called "Star Wars" where the only thing that really stood out were the technical aspects of the project. His directing skills weren't fancy, but they served their purpose. The same goes for his writing. The wise words from Oi-Wan just sounded great because of the actor who delivered them.