"Nah. Fairies are easy to pay. They live in a very naturally rich world, but they only move things, so it's just economics: it's easier for the fairy to move your furniture than to bake cookies, so this is a trade you can get a fairy to make a decent fraction of the time. Angels are harder, they can change matter into whatever they like, but they need to do all their own detail work, so they'll take electronics or potted plants or books. And then there's demons. If you are reasonably fortunate, what you do is you pay demons in information. Lists of music, the news of a new art museum, your favorite author's name. Then we go home and conjure up the discography or the gallery or the complete works. But those of us who take summons have a pretty efficient network for sharing that information and if it's not new and your demon is in the loop, you're out of luck. And then you can try to pay the demon in live animals - we can make those, but we can't make minds, so they don't make very satisfying pets - but there are animals in Hell, now, most of the particularly charismatic varieties, either made painstakingly with the mindless kind as parents or imported. And then you're left with - intangibles."