I would look no further than the basic ingredients of the sport: speed, gravity, zero margin for error and over a long enough run of events you are destined for the morgue. This is not a sport, it is suicide in disguise.
One more thing: it's turned into a small industry. Some of the work in it I am certain is considered to be partly art (I am thinking of the analogy to the sailing industry in the early years of yachting). I wouldn't rule out a look to "advances" in suit design where the new engineering has an unforeseen consequence. Something the advanced guys would jump on board with, but we don't have enough data yet to determine the failures.