It's good to motivate others.
Tom is the Sales lead for a team of Sales reps, he gets a small commission on every representative's sales, he notices some employees aren't making many sales.
Tom wants to maximize his commission payments.
Tom calls a sales meeting with all the agents and gives them a speech to help motivate them.
Tom fires the under performing employee's so that he can hire better sales representatives.
All the employees are motivated and get more sales, allowing Tom to make more money from commissions.
The remaining employee's upset at how Tom treated them all decide to quit, leaving top without any sales agents for weeks hurting his commissions greatly.