How can Performance Testing help me?

This simple question has (not surprisingly) multiple answers, depending on who you are.

Test Sponsors* - increase the value of your tests by being able to prove that a test taker can do the real job - not just describe it.

Consequently, you can charge more for your valuable product.

Test Takers - increase your personal professional value by demonstrating that you are competent to perform the real job.

Not only will you set yourself apart from those that have "paper certifications", you will naturally have increased confidence in your new job skills.  

Hiring Managers - can be more efficient because you can rely on a Sponsor's certification program to provide you with candidates that have proved that they can perform the tasks that your organization requries.

* those people publishing tests