I think it's just Skill + Amount of dedication it takes to learn. I remember being at my local mountain (whitetail) while still riding my softies and i saw, what i didn't know at the time, was a hardbooter. And i thought, "that is so !@#$ing cool!, i need to learn that". That day i went on youtube and searched for carving snowboard, and found the russian extreme carving video and nearly jizzed my pants. Then i found Ryan's how to really really carve video and i lost it again. Very next day i switched my softboot setup to forward angles and started experimenting very aggressively until eventually i learned how to properly ride the sidecut. Then i ordered the wrong size deluuxe boots, td3's and f2 carbon eliminator (don't ask me why i ordered that board, might as well have ordered a solid sheet of steel). Got on the setup towards the end of last season and i was in so much pain and didn't know what i was doing. Ordered a coiler at the end of last season, had my boots properly fitted (which eventually led me to realize i bought them a size too small) and had pius help me with the initial setup and "carving theory". This + a local hardbooter helped me progress tremendously this season and i'm carving some fairly nice trenches now and having a blast. ( still a lot of room for improvement)
So yeah. I say commitment. I could have easily said "screw this jazz" after my first half assed attempt on the f2, but i decided to keep at it. And once i locked in on my very first toeside carve, i fell in love.
Though, i think the industry could really benefit from a more economical entry level setup.