I don't even shout ShB A-Ranks anymore because no one would come. And if you could manage somehow a small group together and pull an A-Rank and someone other sees it, probably you get yelled at why you don't wait x hours till the hunt train starts.

Also I have the feeling that the hunt trains aren't always running when all A-Ranks are respawned, so that seems not so dedicated to me when the A-Ranks are untouched for several hours.