For some reason, companies are perfectly fine with losing their "best performers" for any number of reasons, they won't bet an eye. I suppose it's the equivalent of "we don't negotiate with terrorists"
My theory is that having loads of money gives companies the leeway to simply not care about losing top performers. After all their bank account allows them to get other top performers.
Obviously there are more nuances to this topic.
But they do negotiate all the time. For employees that are critical they do this all the time. For the regular employees? Nope