shit outside the ropes is not avy controlled (at least out here it isn't) and if you're riding uncontrolled slopes without proper avy gear and training eventually someone is going to die, so that's one part.
knowledgeable people will follow your tracks out of bounds and then drop further down the fall line instead of following your tracks back and get lost requiring S&R to go out for them
if you use the resorts lifts to access backcountry you could get hurt or killed and the resort could see a lawsuit.
resorts that do offer an "open gate" backcountry policy do so at a "gate" in the line and will have a sign up warning of the dangers and absolving themselves of some liability - perhaps requiring proper avy gear.
bottom line: if you want out of bounds freshies its up to you to learn the right way to do it. ducking ropes will get your pass pulled or you dead.
So even if you skin up the mountain (if they allow it) you're still obligated to follow the rules of the resort? Obviously if you're going to access the backcountry you're going to be properly trained with proper gear. I know you can have inbounds slides (I was at vail last year when that happened on a closed run). The danger here was the little amount of snow (still waist deep in a few spots
) and the dead fall which to me is a non-issue.