First, screening your guest is a task that takes time and effort as well. We are offering to reduce the work needed for the really low price of 1%.
Moreover, it's not just guest support, but you can also accept new guests while on vacation, allowing even back to back guests. It's almost turn-key service.
With a Lockitron and HomeJoy, I can accomplish most of this myself.
I'm not dismissing the idea, I think it's great for people that need to have their Airbnb monitored. However, you're the equivalent of a property manager. If I'm renting out the room or apartment I live in, I don't see the value. If you're talking about helping out people who have multiple properties on Airbnb, then I could see the potential market. I doubt it's going to have a major upside though.
