If you are intending to stick with teaching for a while, I would highly encourage it. Re-read some of these posts- others believe in the benefits of education. You would be abazed how much more you can learn.
I am level 3 psia, teaching for 20 years,but have no certification for snowboarding. But the psia clinics I still attend can teach so much if you think about how to carry it through to your discipline of choice.
My best client now I got because I was the first person he found who could teach him on a full hard-boot set-up. (I used to work a lot with the Boone Lennon QuickCarve. )
Lots of people taking lessons now are encouraged by magazine articles, friends, etc. to ask for someone who is "certified". Between that, the pay, and definitely being able to learn more about your own teaching and riding, I would say it is worth it.