Hunts weren't designed around the idea of waiting for half the server to show up before pull. It was designed around a party of dedicated hunters going around killing their hunt marks. It works very well for that. Trying to get people on the Internet to "behave", however, is an impossible task.

I don't have an opinion either way as I don't hunt, but this is how hunts were designed and this'll continue to happen unless SE implement some arbitrary restrictions on when it's possible to aggro a mark, which I doubt'll happen.