Dont kill the messenger. I rest assured that H.H. has consulted a marketing firm and have surveys and statistics who the profitable are and who is not. It is probably a part of trier pitch to the potential hosts. They now have adequate stats from the hosts too. There is a video on Youtube about certain campgrounds who will not allow campers older than 10years old in unless you send then a recent photo of your camper proving its condition.
You don't base opinions on " I know one or two people on who don't fit this description". That's like basing an opinion on a political poll that surveyed two people.
there are always exceptions. Look at Amazon. How many times have you seen 5% reviews of 1 star and the balance of 5 stars?
HH spent a lot of money to get this off the ground and rest assured did their research. Business models are based on averages.