It gets more attention because it has the best prices. End of story. And you can literally get anything you want on it or Jita. The only reason Jita is so popular because after being chosen by a lot of people as a tradehub they started shipping literally everything in there. So you have best (or at least very good ) price + everything in almost all quantities you need it.
And everyone knows time is money: Why fly around 20 jumps to get stuff when you can go to 1 systema nd have it all.