dslang said:2. you dont have to shoot using remote flashes. try shooting with the available remote light. focus on finding good angles before you worry about buying remote flashes to light up an area.
although your other points are mostly valid, i would have to disagree with this point. being skateboarder myself, over the years i have learnt many things about shooting skateboarding. remote flashes is one of the most important tools of a professional skateboard photographer, and some leading skateboard photographers such as Scott Pommier (www.scottpommier.com), usually does not use less than 2 remote flashes in his shots, and sometimes even uses around 7, and with his precise aiming of these flashes he is able to create some fantastic photos. using no remote flash would cause the background to be brighter, and the subject darker than if you were to not use it, and often makes the subject look extremely dull and uninteresting. the only moments you dont have to use a flash to make it look good is in silhouette shots.