Waarom wordt de speciale techniek van het golfballetje niet overal toegepast?

Dat is inderdaad 'vreemd'.
http://www.youtube.com/watch?v=BWWe8j3-Vs4&feature=related
Als ik 't even afrond, heb je zo'n 10% minder verbruik als je golfbalputjes op je auto doet.

Toegevoegd na 10 uur:
Voor vleugels (even onvertaald):
"The reason we do not see dimples on other shapes, like wings, is that these particular forms of boundary layer trips only work well on a blunt body like a sphere or a cylinder. The most dominant form of drag on these kinds of shapes is caused by pressure, as we have seen throughout this discussion. More streamlined shapes like the airfoils used on wings are dominated by a different kind of drag called skin friction drag. These streamlined bodies, like that pictured above, have a teardrop shape that creates a much more gradual adverse pressure gradient. This less severe gradient promotes attached flow much further along the body that eliminates flow separation, or at least delays it until very near the trailing edge. The resulting wake is therefore very small and generates very little pressure drag.

However, there do exist other types of devices commonly used on wings that create a similar effect to the dimples used on golf balls. Though these wing devices also create turbulence in order to delay flow separation, the purpose is not to decrease drag but to increase lift. One of the most popular of these devices is the vortex generator."