[Jare]

> my value to the company is greater than $150K, and $150K is a price you're willing to pay to leverage that value

Now change the second "is" in that sentence, to "was".

Offer and demand are (largely) what determine your salary. The value you create is what sets a ceiling to that price.

It's that simple. FB becomes willing to hire people who live anywhere, and stops believing that candidates in SF or other expensive locations provide more value. They will have a way larger pool of candidates, and they will likely find people who provide just as much value for FB (sorry to burst any bubbles here) but are willing to do so for less money than currently happens.