I completely understand, seems that the public will keep paying to see it, but Hugh seems to want to be taken as a serious actor, and being typecast won't help that.
He just can't say no to the Wolverine-offers!
But even still, he often tries to play some serious roles every now and then, in between Wolverines.
Take for example Prestige between Last Stand and First Class, Les Miserables between First Class and Wolverine, or Prisoners between Wolverine and Days of Future Past.
You can only do so much in a year.