anything in it for (one)
Something for one to gain from a particular situation. Why should I help that jerk? Is there anything it for me?
nothing in it for (one)
Nothing for one to gain from a particular situation. Why should I help that jerk when there's nothing in it for me?
something in it for (one)
Something for one to gain from a particular situation. Why should I help that jerk? Is there something in it for me?
anything/nothing/something in it for somebody
(informal) any/no/some advantage, especially financial, to somebody: He wanted to know more about the business but I told him there was nothing in it for him.