Tooing and froing with Seth Godin

Earlier today new age marketing guru Seth Godin kindly entered into a cycle of emails to try and convince him to add his considerable insight into some of Uniloc's developer relations campaigns... what amazed me is his responsiveness. He often got back within hours and sometimes minutes, even responding at 2 in the morning (ie 5 his time). How does he do it? That level of commitment to responding to people must really generate a lot of goodwill for him. At first I thought he must use ghost writers but every answer rang true of him... truly amazing.