Of course I know that not everything is didactic, but here at ETS we pull out all the stops on theorizing. First of all, to open the door, you lose a bit of your energy, a clear metaphor for losing your soul. Inside the door is money, the supposed "root of all evil". (Well, the actual quote is, "The desire for money is the root of all evil," but whatever.)
And thus we reach the conclusion that sinners wind up in a tiny room with weird music and floating eyes staring at you for the rest of eternity.