Skye12_
I don't think he would have to stop being a hunter, other gym leaders have other professions to Roxie, Pokémon trainer, also plays electric bass in a band, Elesa Outside of her job as a gym leader of Nimbasa City, Elesa is a model.. ... just look for gym leaders they don't just stay at the gym they have other dreams they pursue....
You completely forgot about that other task Hisoka accepted at the same time as the SS Anne guarding task, didn't you? You also seem to have forgot that during the Cerulean City Gym Lider task Hisoka thought that he would tear down his own gym himself a month after it's opening because he wouldn't be able to stand that kind of life and now he's honestly considering opening one? There even is a whole arc surrounding that. I know this one is kind of an insignificant and understandable inconsistency but it kind of doused my enthusiasm for this story and it used to be an enthusiasm and a half I have to say.