They certify you Level 3 in what organization? I didn't give the website a thorough read, so I might have missed it. But there's no way in hell you could get Level 3 PSIA in just 12 weeks or whatever they're advertising for. It takes years to get your skiing damn near perfect, not to mention all the experience needed teaching. You have to be able to adapt any lesson to any situation at any time.
I'm Level 1 PSIA, got it after my first year teaching. That's what I'd recommend. Find a smaller mountain that doesn't require a cert, get them to teach you how to teach and actually make money doing it instead of paying 7k. After a year or two, take the Level 1, take the Level 2, then if you still like it move to a larger mountain.