Why would there need to be more rewards? You don't do the content you don't get what comes from it.
Trying to entice people to stop being MMOs players and mindlessly doing whatever is the most "efficient" despite it being entirely unfun and boring isn't going to work, they're all going to find some other unfun, boring grind that takes a fraction of the time less to complete and go abuse that instead.
It's a losing battle with people who see the game as a job/checklist to complete and not as a source of entertainment.