For the same reason might ask why they would take less than they have to.. although it is true that the candidate pool grows, the pool of jobs we can select from is also worldwide.
I mean, I can afford to work cheaper if I want to, but I don't have to because people will pay... the principle works both ways.
Why would I take a 140K/year job just because the people around me are living in abject poverty unless I have to work locally?
The way your comment was worded, I thought you meant accepting $140k/year was akin to being in abject poverty, which seemed like a very uninformed view of the world. I don't think that's what you meant though.
as an individual, if you can demand more money, you should.
as a company, if you can spend less for the same amount of quality, they should.
[1] https://about.gitlab.com/handbook/people-operations/global-c...
Cuz they don't need to!