I'm moving to the bay area to take a job at Facebook in 2 weeks. When comparing all my offers, my wife and I made a budget for each offer to understand the sala

I'm moving to the bay area to take a job at Facebook in 2 weeks. When comparing all my offers, my wife and I made a budget for each offer to understand the salary differences and their cost of living. We know exactly what we can afford. I don't understand why everyone doesn't do this before taking a job somewhere.