Presuming that we're not working for the same firm or sharing profits or running into each other etc.: No direct benefit, as your improved performance is extremely unlikely to have any impact on my performance. Much for the same reason, however, there can be plenty of indirect benefit: Teaching a lesson to someone else can be one of the best ways to reinforce it in oneself - reinforce the lesson itself, also reinforce one's belief in it and acceptance of it, also possibly inspire renewed examination or criticism of it. You may even be lucky enough to teach someone something and in the process figure out that it really is b.s. after all.
If you're one of those people who is ever affected by guilt or self-doubt based on perceived possible worthlessness of trading as an occupation, then the idea that you might have helped someone else might make you more willing to allow yourself to succeed. True, "giving is its own reward" often runs up against "no good deed goes unpunished," but, then again, "no one said life would be easy," and, I might add, "I never promised you a rose garden."
