at first i thought you were criticizing the modifications to the bike, but then even after seeing a video of a stock version being ridden, you continued with the above quote. the bike is called "rodeo". the name and the frame geometry clearly indicate the design intention. it's a trick bike. nothing to do with faster or convenient or commuting. i'm surprised you didn't get that.

personally, i really enjoy seeing unusual modifications. from a design perspective, it's instructive to observe the ways in which end-users choose to extend the functionality of a given device through modification. as to why they do it- who knows? whimsical creativity? clearly, the person is having fun with it. whatever the reason, i enjoy seeing the efforts and often find them inspiring.