My alt is a trades mentor who lives in NN. My main is PvE mentor who doesn't live in NN. So in that matter, I guess it's your personal choice.

Is it worth it being a mentor? I like being a mentor. But since you're almost there, try and see. There will always be bad mentors who are unwilling to help and leave instances at the sight of sproutlings watching cutscenes. However there are some who are willing to help. It'll be nice to have another helpful mentor out there.