"Summoners get a lot of really sadistic demons. Demons who just want to do their own thing hang out in Hell and don't take summons at all; it's voluntary. Even if you want the latest music or movies from the Mars colony, we have a pretty efficient network for sharing that kind of thing around and you can let other demons do it for you. The demons who will show up when you summon them are the ones who want things you can only get that way, and these things are sometimes 'to be the first demon who hears the new album by this one band', but they are sometimes 'to watch mortals squirm'."