Employment, just the same as anywhere else. In this country a job isn't something that most people can simply pick and choose from. Tech jobs especially are very different outside the Bay Area. A big example: it's common to have 18-30 month tenures at a job in the Bay Area, and that's considered "job hopping" many other places. Others include the casual dress and relatively greater time flexibility.

Tech experience in the Bay by no means guarantees the ability to find employment outside it.