What's not entertaining about them? They're going full speed down dirt roads that're barely wide enough to fit the car and they slide totally sideways around the turns, take big jumps, and if they go off course they're either going to hit a tree or jump off a cliff, what could be better?
As for the sport being to small, of course it is. Let's take BMX for example, there're hundreds of sponsors for that, and hundreds more pro/pro level riders. Scooters, on the other hand, have maybe a few sponsors, and not that many riders that would actually come to compete at an event of that size.