Let's say someone gets 5x the person next to them done. Very few companies will pay them 5x. Maybe double...
But if they can manage their time well enough to get X done in some fraction of the time, they could realistically do two or three full time jobs worth of "normal" work, and increase their pay - and income security - over having just one job. This doesn't work when you have to be in person all day, but remote?