^spriggs does sick doubles(he did one at the open) and judging from this thread he learned them on snow. i ramp myself but think about it, its like using artificial means to scale a rock face, sure you stood on top of that but you didn't get there through pure human physical potential, your experience was tainted because what you did maybe should have been immpossible.
i think there is a chance that spriggs is acting as the Paul Preuss of newschool skiing. pointing out that these incredible things people are doing might be beyond thier natural potential.
http://en.wikipedia.org/wiki/Paul_Preuss_(climber)
notice that preuss died of a thousand foot fall. i will ramp but you can make your own choice