I taught full time for two seasons... It paid terribly, I got sick constantly because little kids are disgusting, I got peed on, I got pooped on, I got vomited on, I didn't get to teach one hot girl, I didn't get to teach anybody over the age of 11, I spent countless powder days sitting on the bunny hill praying for somebody with a shotgun to blow my brains out, and when I finally did get to ski all of my friends were tuckered out.
What did I get from this? A meaningless certification and undying appreciation for free skiing.
Here is the deal; I am guessing you are young, in shape, and that you enjoy skiing (I mean snowboarding I am just used to saying skiing). What Ski Instructing will do is make you consider skiing a job, which is not how you want to view skiing. You will feel cranky and old and terrible. You will want to murder children. You will want to murder your co-workers because many of them think they are the greatest skier on the planet.These are the negatives.
The Positives? Free pass, employee discount, an air of mild superiority, a worthwhile job (you are training the next generation of shredders), and the occasional cute gaper girl who asks for advice.
My advice to become a good instructor; Either work part-time and get your free pass and level one certification. This will insure you a job in the future if you want one, and will save you money.
OR you can get a job washing dishes, ski to your hearts content and become an Instructor when you are 40. Why waste the prime of your life on the bunny hill when you can do it when you are old?
And if you do decide to instruct the best thing to remember is that young children hate being in the cold and in the snow for a long time, but they love to be rewarded and win. If you make an imaginary point system and give them points or stars or something for doing little things then they will do whatever you ask them to. It works like a charm, and at the end of the day everybody wins.
Disclaimer: this is my experience, other experiences will differ. I would encourage you to follow your heart. Instructing really isn't the most horrible thing ever, and for many people it is an awesome experience. It is very noble of you and all instructors to want to spread the love of shredding.