As a general rule mastering Poser will not open doors in the job market. Most studios don't care what program you know, as long as you know how to create good animation. If you watch the "making of" on the Incredibles DVD, many of the animators they recruted for the movie were 2D animators and had no clue about computer animation. After all, Pixar runs their own animation software, so why should they care whether you use Poser or Maya? If you don't know when and where to use squash and stretch in Poser, chances are you don't know in Maya either.