Would be nice to actually have numbers about how many houses are actually grandfathered in since I hear lots of speculation about numbers. Could very well be less then you think.

Yes I am one of them. With 2 personal houses. And to the hateful people claiming that second houses are just storage that is simply not true both are carefully and loving decorated.
Using and alt house as storage is simply not very feasible since everything that has been placed becomes untradable and since we can't become a tenant of our alts you can't ever use it again in another house