It's because you are using facts to argue with feelings and that will never work. Belt drive is clean, quiet and almost maintenanace free, so what's not to like?
PS. I've heard the same arguments regarding belt drives on bicycles.
On a bicycle it is a fact that a belt drive has more energy loss than a well maintained chain drivetrain. So belt driven bicycles are often used for commuting, where the fact that you have almost no maintainance to do is an important aspect. Also you cannot use a belt on a derailleur drivetrain, so you have to have a bike with hubgears, a single speed or a gearbox like Pinion. On full suspensions the belt tension is something to take care of, the frame or rear triangle has to be split to get the belt on or off... which usually means a belt-specific frame design.
So there are pro's, but there are con's as well. So it's up to personal preferences, use, etc. which works best.
As far as converting my Conti to belt drive, I don't see enough advantages to do that. I ride 3.000~4.000km a year and never in the rain if I can avoid it. A chain will do fine.
But it's good to have the choice if anyone wants to do the switch, so kudo's for the nice work!