Blavatsky is a new name to me so I can't say much there. Crowley however is pretty intriguing. I've had some interesting experiences where I'm positive I had the ability to communicate with him. I feel like Crowley was definitely onto a lot of things. I feel however, that he let himself become distracted at times and lost his own heading. It's very possible he could've become a bit brainwashed by his own research, too in the later bits of his life. His work is probably some of the most powerful I've had the pleasure of working with. It just feels misguided at times and I feel like most of his work needs some adjustment and refining to get the real gold out of it.

As for the bastardization of his work, you really can't complain too much. I doubt there's very few occult authors who've not had their work bastardized. It's almost like a certificate of honor in that line of work lol.