The real game to be in here is real estate. Don't mine the gold, sell the shovels.
And the "game" for them is simply to survive.
Someone with a third of my salary gets a house, a car, and more disposable income which goes further. The one area where I'm really blowing them out of the water is my $5/mo health insurance that makes all care effectively free. That's a function of the company, though, not the salary. Our much lower paid, lower skilled workers in satellite offices get the same benefits package.
The point I'm trying to make is that, thanks in a large part of very some "boom" you and I riding on, a lot of people not only can't afford to live in SF (or other pricier parts of the Bay Area) with a car and travel money -- nowadays, they can't afford to live there at all. Whereas 20 years ago, while it was never easy to make it in the Bay Area -- at least theoretically they could, at their skill and education level.
So while $120k may seem like chump change to you, it'd be a godsend to them. They may still not be able to travel, and they may have to cut back in a whole lot of other areas -- but at least they'd be getting by.
Which is again, the real "game" for most people.
Even if you think you can easily do better, you shouldn't "laugh" at salary offers in that range. The vast majority of people in the U.S. won't ever -- at their current (and for many, basically immutable) education level -- stand a chance of making anywhere near that much.
And being as it's just a matter of blind luck that we've been born at a certain time and place that enables us to make that kind of a salary.
For basically playing with shiny toys all day, and all.