Yeah, I feel sorry for the guy. He still is expected to do work for free promoting a movie he was in forty years ago. He must be incredibly sick of Star Wars by now.
He's clearly not sick of it. Harrison Ford is a bigger star than Hamill, Han Solo is at least as iconic a character as Luke, yet Ford did far, far less PR around TFA than Hamill's done for TLJ. Ford is fairly well-known for being sick of Star Wars (he wanted to die in Empire), so Hamill clearly had the option of being less involved in the PR yet chose not to.