We all need to accept that people are looking for different things in life. It's difficult to save money in SF, while also having a lifestyle that's relatively easy to maintain in other places. For instance, living without roommates.
I'm mid 30s, wife, kid on the way, and own a home in Sfba with reasonable commute.
You're able to do that because you're obviously "unattached" or "young"... You live in an apartment with a roommate. That's probably fine when you're single/dating. It's not super appealing when you're a person with a spouse and kid(s)... Also, as one progresses in age, there is a desire to stop having 'roommates' and perhaps even consider owning something.
The cost goes up considerably within those parameters.
It's "easy" to save 40% of your income if you live like a college sophomore in a dorm. It's not when you have other responsibilities.
* a meaningful degree of racial diversity (makes a big difference if you're not white)
* comprehensive public transit (yeah, yeah BART and MUNI suck, but where I've lived in the US previously, they didn't even exist)
* an abundance of job opportunities in tech
* nice weather
I'm able to save 40% of my income and I don't even work at a high-paying company like Airbnb, Google etc. I live in a new apartment with one roommate in an area that's only a 25 minute commute to my office in SF via public transit.