The vast vast majority of tech firms in SF do not compensate at that level; Yelp, Uber, Square, Twitter, etc, that list goes on. They're all right around that $125k + $5-$20k signing/moving + a fraction of equity for entry level, then scaling up ~5-10% for each position above that.
These Engineer 3/Senior Engineers at a place like Facebook making $400k total comp are, for the most, true stories. But it's not even close to representative of the bay area as a whole.