In a very short-sighted sense. You treat employees like this and you quickly burn them out (decreasing medium and long term productivity) or create turnover (wasting time recruiting, interviewing, ramping up, and occasionally hiring someone who's wrong for the job).

Edited to add: and why does everyone think it's acceptable and even commendable these days to be only out for yourself?

Marketplaces are most ruthless and often immoral in their emergent behavior.

I'll definitely agree that the results are often bad.

I won't agree that anyone should ignore the reality of it though. Realize that it is the most literal definition of a marketplace, and nothing is going to change fundamental fact. Once one accepts that, he'll be much better grasp of how to make it better.