Again, you make lousy points but probably not downvotable points. The Bay Area has a major tax disadvantage in prop 13. San Francisco is perhaps the highest ta

Again, you make lousy points but probably not downvotable points. The Bay Area has a major tax disadvantage in prop 13. San Francisco is perhaps the highest taxed city in the USA. If a geographical area is just slightly more appealing than another area, you would expect people to migrate there. So I'm not really sure why you think the concentration is irrational. It's really the opposite.