Exactly those are the ones who could legitimately use it, without driving rents. That is the original idea for AirBnB anyhow. Why not put a limit for 30 Days i

Exactly those are the ones who could legitimately use it, without driving rents. That is the original idea for AirBnB anyhow. Why not put a limit for 30 Days in the Regulation for when you are not home? It would be easy for AirBnB to limit and it would not be economical for commercial offerings.