We need another Housing purge

[worldofneil]

how a single guild can own 10 houses under their name.

They don't and that's not one FC, that's multiple FCs. Yes they're all likely to be the same group of people, but they're still individual FCs that they had to level each up to rank 6 to be able to buy a house. And since one person could only create a maximum of 8 characters on a world, for 10 alt FC houses there's definitely more than one account involved.

I can see how it looks like it's a single FC, but if you look at each house "owner" you'll see a different FC. They just happen to all have the same "short name" because the game doesn't require that to be unique.