They are loyal P51-D followers not Pony in general.
If the Tempest was unperked I would bet most of those would suddenly mutate into diehard Tempest lovers.
My point is: they aren't really "loyal P-51D followers". A true fan of that plane would't scream and kick if being forced out of that plane by ENY, but just go to the B model.
Those that just look for the second 'best' plane still available are just looking for exactly that: The best ride possible. They are 'maximum performance' followers.