The phenomenon of Crowley can probably be attributed to his wares aligning with the mindset of the richest weirdos the world had to offer. To have "wealth" is to live in another world; one where your every wish and command could be granted by someone looking for a dollar. Magic is that wish fulfilled. To have power to affect that level of change, only true held by the most wealthy. Afterall, isn't it a relative of the Rothschilds who supposedly discovered how to turn lead in to gold?
I challenge you to read this book. If you do, I will give you a free membership to Brooklyn Paranormal. I will think less of you as a person, but I will admit you to the group.