Not meant to be argumentative...
I know a family with toddler that was injured by a falling bike at a Dealership. I consider tractors with implements pinned or in the down position safer.
Of course a child could be hurt at a motorcycle dealer, but they can be hurt almost anywhere they go. That doesn't change the overall potential for injury at a place like a tractor dealer where there are large, heavy items, that move, and have things like implements, etc, etc.
I've seen lots of tractors on display with buckets up in the air...pretty common, but pretty risky when you think about it. I doubt most dealers do anything to secure implements in the down position, but it's certainly a great idea.
As I said earlier, I wouldn't ban kids from my lot if I was a tractor dealer, but I would try to put some measures in place to keep kids safe...starting with educating all the employees.
People forget how comparatively dangerous tractors are to things like cars (discounting crash statistics). Just the other day my neighbor stopped by while I was running my tractor (he has five tractors, a dump truck, three forklifts, so he's familiar with them). I lowered the bucket, and shut down the engine, because we usually chat for a while. He had his hand on the loader arm, fairly close to one of the pivot points. It occurred to me that if the bucket wasn't all the way down, and if he accidentally had his hand on that pivot point, downward movement could mean loss of fingers....and that was just a loader control bump away.
You just don't find things like that with most consumer goods these days.