The thing is, it worked.Not as much as you might think. Remember the issue that was caused when he offered to pay the Mercenaries? He had no idea that would cause such a split in the group, or that he would wind up (as #2) following someone else's orders on account of it.
Ging, like Gon in a lot of cases, doesn't necessarily always think about or take others' thoughts and feelings, or their status on a given subject into consideration. Gon, I can pin it on his age. Ging doesn't really have an excuse, though.
Why have requirements to go over if success is not the intended goal?
Both ging's and pariston's predictions are a lot about gut feelings and adequately reading humans.
They do things and if they go wrong, they do something else. In this case, ging's action paid off.
We know that ging is a double star hunter. he didnt get there by not being able to teamwork. He spoke of all his teammates quite fondly.
He was able to pull off feats in ruin hunting and he was able to create greed island.
People might not like him a lot, but he is able to lead teams or at least partake in them.
So i am convinced that the reason ging did not go yet is because whatever the gatekeeper wants is not something ging can offer yet
Why would the same thing that protected Humanity before not be present now?