At the risk of sounding facetious (which I am) and cocky (which I am also)
There was chocolate in the cup (only half), it's only my second week with the V8F and yes there is a 15 feet drop if I let go of the Wheel!
I can relate to your post, I felt the same way when I first discovered Hirsute four years ago ( I mean "the man is crazy").
Since I acquired my first wheel 3 1/2 years ago 90% of my mileage is tricks, I ride around 30 minutes nearly everyday in the summer and I train systematically.
I think anyone in decent physical condition can perform similar tricks comfortably with proper training and perseverance...