Don't sell credits; don't sell walk-on roles... If people want to back you, they'll back you. But if you have to entice people will walk-on roles and crazy credits, you're undermining yourself.
You get to the end of something, you're laughing, you're like, 'That's funny, and that's funny,' and then you get to the end, and the credits come down, and you're like, 'That's it?! That's the whole thing?! You had me here for that?!' I just don't want to do that.