I in fact work in prop trading. Our owner was once asked about more people joining the team as we grew making the bonus pool smaller. He (rightfully) said that

I in fact work in prop trading. Our owner was once asked about more people joining the team as we grew making the bonus pool smaller. He (rightfully) said that the team member should focus on making the pie bigger than getting a bigger slice of a small pie. It’s worked out very well for us.