> My guess is that it's because it's actually hard. I'd imagine it's hard because the backing data is unreliable. Between hand typed listings and tax records,

> My guess is that it's because it's actually hard. I'd imagine it's hard because the backing data is unreliable. Between hand typed listings and tax records, there's a lot of places for things to go off the rails if you set an algorithm loose on unmassaged RE data.