OP, if it makes you feel any better, I recently purchased a brand new R (non-demo). It too would not start at the dealership. They tried jumping it, and it still wouldn't start. The owner then took executive action and replaced the battery.
These sales representatives probably turn on the info screen multiple times a day for months. It makes sense that the battery isn't solid.
While the dead battery wouldn't concern me, I might be a little concern that it's a demo. I would imagine that the test riders have not been riding within the break-in guidelines. Might be worth the risk, though, depending on the deal.
Last edited by stowanewb; 09-02-2019 at 05:16 PM.