Rather like "if you've never missed a plane you've spent too much time in airports", companies believe that there's such a thing as employee retention that's too high; it means you could be squeezing their pay more in order to force them to quit.

Doesn't account for all the tacit knowledge and morale effects of course. Some people just like running the Hunger Games.

& a good corporate reputation is just another asset like a rainforest: something you can burn to top up profits this quarter.