Well exactly what I said before. Star Wars is just meant to be a fun movie in which you can sit back and watch and enjoy. And that is probably why Star Wars is a little more popular than Star Trek. Because it doesn't take itself to seriously.

And you want to know what the story of the Star Wars movies is supposed to be about. It is about the fall and redemption of Anakin Skywalker.

Besides, I am sure the majority of people would prefer to watch a fun light saber duel between Jedi and Lords of the Sith long before they would want to sit and watch all the things in Star Trek that just makes you sit there and think.