Hail to the Voice Actors

So we all know about voice actors.  Anyone who has watched any animated tv show/movie knows they are the people that make all those pictures talk, sing, sigh, sob and whine.  However the job of a voice actor is growing everyday. (Things I learned 1)  Many of them like Frank Welker's (who does the voice of Optimus Prime) and Seth McFarlane who does Stewie are getting more and more recognition.  (2)  These people are getting fan mail now! (3)  Although already popular in Japan, voice actors and dubbing is a trend slowly rising in American culture as well.  (Opinions 1)  I think it is wonderful that these voice actors, these names at the ends of the credits that no one really watches (except my parents) are getting this recognition for giving these characters life.  The CGI could look and feel as real as it possibly can and it still wouldn't be able to do the same without these voice actors giving them life.  (2)  I think it is great that voice acting is coming up in the ranks of American culture and am excited to what new movies that will appear because of this growing industry. One question; why aren't these people given the credit they deserved before?