Yes and the commitment to fasting and spiritual preparation can’t be fun. Nobody wants that job. It has to be a calling I think.
Another common situation ( relatively speaking) that I’ve seen within the Muslim community is that people get into it to deal with their own supernatural affliction then carry on from there. This is because it’s often difficult to find someone who can legitimately do this kind of thing. There are a lot of frauds out there. Then those who do this stuff are both busy (a lot of cases to deal with and many people trying to get an appointment) and in high demand, so to speak. So some just decide to learn it on their own and treat their issues themselves.