I could see that being both useful and obnoxious. Though I suppose you could always find some fatal task for the more insane servants and recruit new ones to keep around as long as they can carry on a conversation. Unless their sanity loss is instant.
Powerful nonhuman entities-? ...Oh. Her. Got it. She doesn't own me, but I'm willing to bet that she knows what's best. Maybe if I asked her- no, I really shouldn't.
You could most likely amass a small army of his fans and convert them to worshiping you rather quickly. That would be hilarious.