Have you ever used the krewe rules to represent things like regular mystery cults?

[Anyoneatall]

Do they work well

Would it even be worth it?

[Live Bait]

The Mystery Cult merit was created for this purpose and Geist added it as part of how Krews work.
If that’s not enough information please clarify what you would like.

[21C Hermit]

No experience myself, but theoretically it would work nice when playing as equal allies of or decision-making leadership of the cult in question, and where the latter is prominent as a ‘party member’ by itself.

If the cult is antagonistic instead, the Conspiracy rules from Deviant might work better, as it gives you guidelines to confront them.

[ArcaneArts]

I tend to use Deviant's conspiracies more now that that's out, but basically, if there is an organization-any organization at all-that matters and can (not always will) send people to cause you problems, I style it up with the organization rules that started with Geist. From freeholds to caucuses and consilium's to Elysium's and more-well, I think I've made my point.