I hear your point Eva, I have to say that in my view, Increasing the cost to the host is not a solution as the host will simply increase the cost to the guest to cover the difference therefore a mere task of moving from pillar to post.
In general Airbnb host do not charge much for their accommodation whist still trying to provide a great experience. I can only really speak for myself so to give an example, when I deduct taxes, utilities(water, gas & electric), essentials (shower gels, shampoo, hair conditioner, toothpaste, toilet paper, hand wash), parking cost, beverages(tea/ herbals, coffee, hot chocolate, juice, milk and bottle water) couple of cereals, fruits, bread & butter plus I provide a snack basket, I'm left with half the amount of my daily charge which contributes as a percentage towards my mortgage for the room. I'm fine not making a profit but if I make a loss it won't be worth it so if Airbnb charge me more, it only gets passed on to the guest - ultimately the guest will still pay the same price just collected from the host instead of Airbnb so what's been achieved.
Airbnb do not own any properties as such need to provide favourable terms to hosts in order that hosts let out their properties on favourable terms to guests and It’s working very well, you don’t get much cheaper like for like than Airbnb and globally as well.
It’s not necessarily a negative if competitors pop up, it just means a demand for a service/product has been recognised; Airbnb is a competitor for hotels but hotels are still thriving, each has their niche.
Ama