Don't forget Greyhound Therapy either! (Over which SF is currently suing the State of Nevada) http://www.thedailybeast.com/articles/2013/09/23/nevada-sued-for-

Don't forget Greyhound Therapy either! (Over which SF is currently suing the State of Nevada) http://www.thedailybeast.com/articles/2013/09/23/nevada-sued-for-greyhound-therapy-for-mentally-ill-patients.html http://www.thedailybeast.com/articles/2013/09/23/nevada-sued... The history in this article is very interesting, but I always figured that the answer was more simple: (1) generous social programs compared to the country's norm, and (2) mild climate.