Those type of salaries only really exist in San Francisco bay. The marketplace is actually pretty competitive for such well paying jobs. But keep in mind - $100k SFBay is approximately $65k for most of the rest of the country.
The US Dollar holds significantly different value in different parts of the country.
Not really, since, if you take a mortgage to buy a house in SF/SV, you may have as much discretionary income left as someone in say, Alabama, BUT you're slowly building a $1m+ asset (that you'll be able to sell once the mortgage is paid). So, $100k is only comparable to $65k in most of the rest of the country when you're renting.
The US Dollar holds significantly different value in different parts of the country.