All these "you need to make a gazillion bucks to live a middle class life in SV" articles fall prey to the same fallacy.
Comfortable !== Luxury
Yes, SV is one of the most expensive places in the country (maybe the world) to live. But if you're willing to live even a 20th percentile lifestyle instead of a 2nd percentile lifestyle, you don't need 2nd percentile money, even there.