You've gotta remember that unlike a lot of stars these days, Dylan came in as a genuine outsider to "the industry." He wasn't raised for showbiz, he was just a random nobody who got discovered and thrived at it. So I'd say there's a decent chance he's just not into fame. He can afford to be selective with his projects because he spends money like someone who grew up without a lot of it, ie, rarely. He is kind of living the dream at the moment; he does what he wants, everybody loves him, and then he disappears from the public eye until he decides he wants to do something else. He is well liked and talented, so plenty of people are happy to hold the door for him whenever he feels like walking back in.