[lotsofpulp]

People perceive a lower probability of advancement in other regions, and lower probability of securing similar employment in the event of turbulence at your employer. It's a personal decision how much value to assign to these possibilities, but obviously it's significant enough to sufficient people that Stripe is having to offer extra incentive to move.

Although the above is not the only factor. Obviously there are things like weather, geographic amenities, politics, etc to consider.