@Serge12 In all likelihood, Airbnb is not loosing money, since those people booked somewhere else, but probably with another Airbnb. Your 75% is resulting because you are being personally selective, and that is something Airbnb doesn't necessarily like (they probably look at it as some form of 'discrimination').
So what, it is not their place to protect, but yours and according to their way of thinking it is not to their advantage (or reaching some social goal), but it may be to yours.
There lies the balancing act: your caution vs. their perceived self interest or social conciousness.
P.S. If I couldn't exercise such tight control over my hosting, by virtue of the logistics involved with my particular place, I would never be a SH because I wouldn't ever reach 50%, never mind 88%. And won't care either way.