What's the catch?
This question isn't just for Rosemary's Baby but also for any works of fiction that feature deals with the Devil. I've always wondered, what's the catch when you make deals with him? Usually, the trade is you "sell your soul" for earthly wealth and power.
But then what? When your mortal body dies, you have to burn in Hell for all eternity? That's a sh*t deal! So how does Satan actually convince people like the Castevets without them concluding, "Hey, wait a minute - eternity is much longer than my life on Earth. I think I'm getting ripped off". Or are these characters supposed to believe that Satan is just as powerful as God and that they'll be given a favorable position (i.e., not burn for eternity) at his side?