People generally don't suffer high rates of PTSD after natural disasters. Instead, people suffer from PTSD after moral atrocities. Soldiers who've endured the depraved world of combat experience their own symptoms. Trauma is an expulsive cataclysm of the soul.
We are all fundamentally equal souls, and if you make a zillion dollars, you're not any better than anybody else spiritually. You're still an equal soul.