Because Fox dont want to give that license back and Marvel is being a bunch of petty bytches about this shyt... Remember as long as fox keeps making films with x-men characters and or mutants they wont revert back to marvel unless it's under extreme circumstances and even if the x-men movies do suck they are still a box office draw the shyt prints money so Fox is reluctant to give back them rights I believe...
how is that petty? so they advertise and put out merchandise that fox gains a high portion of? i love the x-men too, but it is what it is. and its not like comics is going through some sort or renaissance that he x-men are missing out on. its garbage across the board