I can't really see a city like san francisco being all about the money in this case. It's really all about following the rules that everyone else does. If you airBNB your place you increase stress on city services, traffic, parking, sewer, Police, fire, etc. You also run the risk of safety violations and you are basically increasing the rent pricing of which the city has very specific rent control over. Which if you took advantage of the rent controlled apartments in the city you could technically make a killing on those apartments through AIRBNB. Those rent controls are there to help low income households live in the city they wouldn't be able to otherwise or continue to live in a home they've rented for 30 years etc. keeping people a part of the community rather than ripping it apart.