With divine or spirit cults, failure to adhere to the requirements of your rank are easy to punish. Divine cultists can lose access to their magic or be pursued by spirits of reprisal, and spirit cultists might also be pursued by spirits, or a shaman's fetch can make his life difficult in any number of ways.
I can't think of any such mechanic for sorcerors, though. If an Adept wanders off and doesn't make his/her 25% money contribution or attend services, what then? Are the consequences entirely mundane, and imposed by the cult hierarchy if they don't have a decent excuse? They will lose access to the grimoire, so they can't learn new spells, but there's nothing in the rules to prevent them spending IRs on their grimoire skill without access to it.
I can't think of any such mechanic for sorcerors, though. If an Adept wanders off and doesn't make his/her 25% money contribution or attend services, what then? Are the consequences entirely mundane, and imposed by the cult hierarchy if they don't have a decent excuse? They will lose access to the grimoire, so they can't learn new spells, but there's nothing in the rules to prevent them spending IRs on their grimoire skill without access to it.