I can imagine my Dad in Eternity doing what he had done for many decades: drawing Yellow Page ads. Many of his salesmen would be there, to take his work and sell them to those entrepreneurs who, even in Eternity, who see a need and create a business to tap the market for that service or product. It makes sense to me. They would advertise in the Eternity Yellow Pages.
On the hillsides in Eternity, there are all these people stretched out, sleeping. They are the ones who Dexter had told: "you can sleep when you die". In this life, you needed to go without sleep to maximize your productivity.