How many people have multiple houses?

[Valinis]

Here's the thing, let's say they made these changes, what's to stop people making several service accounts (I have a friend with 3 active service accounts for example), to get housing on each of them.

That's fine if they want to pay for 3 accounts.

And when I put forward the idea of instanced housing (as an extension of the current housing), it got shot down instantly. Like I said, some people like the current system.

I seriously doubt it got "shot down" as you claim. Everyone knows this is the proper solution that SE refuse to use.

Housing is the worst abomination in this game, agreed.