I wouldn't want to be an instructor, always having to teach beginners and spending days sitting on the snow teaching people to sideslip on the bunnyhill.
If you are a damn good rider, and can articulate yourself with out bro-ing out too much, you will be valued as a high level instructor and get the more advanced lessons, better tips, and more money in general. Everyone has to do beginner lessons every once and awhile, but there are likely other instructors that don't ride as well and beginners are all they can teach. Full timers also get priority over part timers, so if you don't want to teach a beginning lesson, you can pawn it off on someone else.
I've said this before and I'll say it again, who doesn't want to get paid to take out an advanced lesson and show them the mountain? You get to shred glades, steeps, pow and park... and GET PAID!!
I taught mostly upper level lessons, but there is a rewarding feeling associated with getting someone to make turns in only an hour or two!
But yes... If you can't handle not doing exactly whatever you want whenever you want on the mountain, then it's not for you.