The only thing about a ping check -- is ping values fluctuate when using mobile internet (3G, 4G, etc) depending on how many people are online. This is why most mobile games have no ping limit. PC games tend to rely on a dedicated router which usually give consistent pings according to location, other signals in the air, obstructions, etc.
I'm not sure if a ping limit would be best for Dogfight. Very very rarely do I ever encounter someone whose internet speed is so bad -- that even I can't kick them because their download limit must be the speed of dialup.
The command simply wont register. But if that's the case -- they usually aren't doing much anyways. Most are just idle.