I'll give you an answer that is specifically tailored to Malboro so the point might get across more easily.

Malboro - November 2021

Free Company houses: 1,709
Personal houses: 4,051

Characters that had access to Free Company housing: 46,288
The theoretical maximum amount of characters that had access to personal housing: 16,204


While the number of characters that had access to Free Company housing cannot be disputed due to being taken directly from The Lodestone, the number of characters who had access to personal housing through ownership and tenancy is much lower than what's written above.