Star Wars merch isnt limited to Jedi robes lol. Yoda backpacks, shirts with different characters on them, shirts with quotes or witty SW-related pictures, custom lightsabers, collectible cups, figurines...the list goes on and on. And I see WAY more of that stuff than Star Trek stuff.
Yea but I can get half that stuff at the local Hot Topic or Spencer's. There is less of a uniqueness factor with Star Wars than Star Trek. Everyone has a light saber, I can go to Toy'R'us right now and pick up an 100 dollar light saber. Don't get me wrong, there still is a limit for Star Trek but how many places can you go buy yourself a star Trek Type 1 Phaser? Spock Ears could be the next Mickey Ears if marketed right.