I think it's pretty clear that magic attracts a lot of cookers,*
* Australian slang for people whose brains have melted (been cooked) from too much Qanon / flat earth / fox news / sovcit / etc etc content and not enough touching grass - being interested in any given "conspiracy theory" doesn't make you a cooker, but you know a cooker when you meet one. Also includes non-conspiracy theorists with the same obsessive and divorced from reality vibe.
Even if your mind is a little looser than most, if you can still function normally, Does it matter how you compare to society?
Like everyone is talking about the DSM-V and "what is the definition of insanity" and you're all completely right about the suspect nature of the medical health establishment, but also, but also...
come on. you know what's being talked about here. you see the stuff they post. There's currently a guy on r/occult posting photos of Alistair Crowley multiple times a day and saying how beautiful and mesmerising he is, and that he, OP, is taking dictation direct from Crowley. Saying that once or twice wouldn't show he's crazy - maybe he really is channelling Crowley, maybe he's channelling something that says it's Crowley, who knows.
The reason I say he's crazy is because he posts this stuff many times a day [he's probably been banned now tbh], and then gets furious at anyone in the comments who says Crowley was a bit of a dick. Then makes a fresh post titled YOU CAN'T JUDGE AN IPSISSIMUS and then gets extremely upset when everyone in the comments gets mad at him again and tells him to stop posting. He is not socially functional, he keeps repeating behaviour that makes people mad at him - but he's not a troll, because he gets very UPSET that people are mad at him, so he's sabotaging himself.
THAT'S cooker behaviour - not just "believes in lizard people" or whatever, but "cannot have a normal conversation about anything because everything is a trigger for them to talk about lizard people, and talking about lizard people works them up into a rage, so any conversation ends with them ranting angrily"
Things you see on magic forums: people with no sense of personal boundaries (telling complete strangers their life stories and personal traumas in extensive detail in response to unrelated questions, expecting unreasonable amounts of help and support from strangers, etc). people with martyr complexes. narcissists. people making pass-agg comments about how no one on those
other forums could HANDLE hearing anything TRUE (the forum equivalent of the guy who says every single one of his exes is a crazy bitch, making you go "I'm noticing a common denominator here and it's not the exes")
I think at the human, non-medical level, we actually mostly do know crazy when we meet it and it's disingenuous to pretend we don't. It's not the beliefs, it's the behaviour.
That said, to answer the original question, I think the occult attracts a lot of crazy people (or rather, people currently experiencing a period of craziness, we don't know their whole lives) but they don't tend to get very far because their interest is surface-level, and when they don't get what they're looking for out of it, they move on
(** Fun side note, cookers are easier to spot in Australia than in the US because they import all their talking points from US sources. When an Australian says "I don't have to pay taxes because the US constitution says so", you don't need to read the US constitution to figure out if they're correct or not. Really saves time. They import conspiracy theories about what's happening in the tunnels under New York to Australian cities with no tunnels. They also import victim figures to Australia, so will tell you "10 million children went missing in Australia last year but no one's talking about it" and you're like "half the population of Australia went missing last year, huh? Interesting.")