To me the allure of the belt drive is lack of maintenance. Lubricating and changing the chain is really the only thing I ever do to my bike on a regular basis. Other than that, I change the brake pads every fall, and switch to studded tires and back at either end of winter. And replace tires every few years. Chains are the only thing I have to deal with weekly. Belts have the promise of eliminating by far the most labor-intensive maintenance item.

And they're not greasy.