I lived in Mountain View 2007 to mid-2008 for my job at Google. We were renting a house close to campus at the time and contemplated what it would cost to put down roots and stay -- most likely buying a condo or house. Every time we ran the numbers, it made no sense, so we voted with our feet and moved back to Chicago. I would love to live in the Bay Area again (there's a soft spot in my heart for the running trails of Marin County, in particular), but it still makes no financial sense. The lower cost of living in Chicago adds directly to my personal financial runway and allows me to work on what I want, when I want.