He has got no time to spare to come up with any extra ideas. He even moved his bed to his office so that he wouldn't lose a couple of minutes every day in walking between a bedchamber and an office. Considering that, it's believable he didn't think of revenue from ads. He only needed the communication orbs for two things: public announcements/propaganda and communication with the saint empress. After that was done, he was done with the things.