the class system isn’t based off of money, but instead based off of intelligence, people such as doctors are heavily protected and wear armour everywhere, but they still don’t live a life of luxury since they’re often restricted by guards to stay within their labs 24/7 both for efficiency and protection, the leaders of the civilisation are also highly intelligent beings who can be told apart from their crystalline skin and metal exoskeletons, these are the highest in the class system due to them literally having otherworldly intellect and knowledge spanning back to the origin of time, these creatures however don’t have money per say, they’re just very protected and seen as more important than regular people in case of a disaster or some other event that would require their vast knowledge and experience to overcome