Peter Mayhew had a huge part in Star Wars. He also had the last line of the movie. Unfortunately for Mayhew, his actual face was never seen. Mayhew played the Wookiee, Chewbacca and his roar was the last line of the movie.
The tall actor (7'3" at his peak) is very popular on the autograph circuit, mainly because of that role. Clearly Chewie is one of the top 10 characters in the SW franchise (at least I think so). That alone could keep him busy and financially comfortable for his life.
Mayhew was quiet and reserved when I met him. He wasn't unfriendly, just almost shy. He talked when people asked him specific questions, but he wasn't a big chatterbox.