They are out there!
We almost stayed in this one but the trip got canceled for some reason or another. 289 reviews, all apparently 5 stars. Seems to be working for them...
https://www.airbnb.com/rooms/4678535
Edit: Also, just counting the stays that left reviews they've made ~$17000 so far. The conversion doesn't look like it was all that intensive, so they've almost certainly made money.