Sort of a continuation of my previous post: I only started park when I felt that
A: I was good enough to go in there and not be too terrified
B: I felt like every other part of my mountain had ceased to challenge me (not to brag, just being honest)
As far as the east coast is concerned, the park is among the hardest parts of the whole mountain to ski. I think that one should start skiing park only when they've become a good enough skier to handle all the other challenges that a regular ski resort can throw at them. This will lead to someone being an all-around great skier. I think the same goes for BC and that kind of stuff, but even more so; BC is a lot more dangerous, and I'd say that dropping cliffs and that type of thing takes far more skiing skill than park does; at least initially.