While royalties alone pay less than most jobs do, they serve as a great bonus to the incredibly lucrative writer career. Royalties reward Sims with a certain amount of money weekly depending on the book's quality, with a bestseller resulting in base royalties of 200-800 simoleans. Sims have to author books to improve their job performance, which leads to these published books earning Sims even more money via royalties.
Not only is the author path for the writer career one of the highest paying jobs in the game with a max of 465 simoleons an hour, but it also ties in beautifully to the game's book-writing mechanics. The writer career in The Sims 4 may be the most overpowered career path that a player can choose for their Sim.