People buying houses for $1 million are wealthy even by the standards of the Bay Area. Median household income in the San Jose-Sunnyvale-Santa Clara metro area is ~$125,000[1]. A traditional $1 million mortgage would require a $200,000 down payment, and ~$5000/month. The monthly payment alone would be 48% of the combined monthly pay for everyone in the household in a household making the median. House purchases at this price are only possible for households that are making significantly more than the metro-area median.
[1] https://data.census.gov/cedsci/table?q=United%20States&tid=A...