Just a mental exercise here - I don't use margin for options aside from the requirement of a margin account to trade at Level 2.
Sometimes in the thin markets where I participate, the Market Makers are not very active, and I'll see ridiculous asks. My account summary dutifully displays these as negatives against my underlying and I laugh it off until expiration.
But maybe it's not a laughing matter to someone on the fringes? I'm thinking an account owner may have very little recourse against a brokerage issuing a margin call, to say: "That is NOT fair!"