The advantage to this: imparting momentum to the skater. Imagine a stationary skater on her board just outside of the pipe center. The pipe's rotation would push her toward the end of the pipe and out. Skaters starting in the middle and moving out toward the ends would pick up speed as they moved out, then slow as they move back in.

The factor limiting skaters from performing an entire circuit of a closed pipe is the intermediate points: lost velocity at the 2 oclock position will cause the skater to fall through the air onto the floor of the pipe. The structure of a pipe, full or half, precludes the skater from gaining enough velocity to do a loop-de-loop.

The rotating skateboard pipe makes the loop-de-loop possible. And isn't that what we've all been waiting for?