Do it. It is worth the investment. Becoming a judge will give you more knowledge to be able to better understand and appreciate all the different styles. The process of becoming a judge, as well as the judging itself, will introduce you to many very knowledgeable people with whom you can have discussions as deep or as broad as you like on a variety of beer and brewing topics. And yes, you will become a better brewer because of all of this.
Just accept all of this with grains of salt as well. The BJCP gets a lot of things wrong, too, and that's okay. They are human, as we all are human. When you become a part of BJCP, you'll need to tow the line for the most part when it comes to competitions. But when it comes time to fill out the "Overall Impressions" section of a scoresheet, or when it comes time to change the guidelines again (whenever that happens), you will have opportunities and a little more latitude to express your own views based on your own research or experiences.
I hope that you and every prospective and current judge out there will never fear to express in words what they are tasting and why it is great or not great, regardless of rank. I swear I learn as much from Recognized rank judges as I do from Masters. Don't let anyone else tell you what you are tasting, regardless of rank. They are your taste buds. You are the one tasting. Put down what you taste, and let that be your one true guide, regardless of BJCP or anything else. I wish this to be true for every judge and beer enthusiast out there.
Dave Taylor
Certified #A0511
Disclaimer: The views expressed above are my own and BJCP didn't tell me to say any of that stuff. They might not even agree with me on all of it. And I don't care. I'm my own person and spoke from my own heart. Cheers.