Because a lot of players want to see other people having just as much fun at the game as they have. Talk about your training corps. They're selected based on their willingness and ability to help others. While we do offer compensation because it is a lot of hard work, the real incentive is the satisfaction of helping people. We use player feed back and suggestions as a guide to what they are interested in.
Vehicles are there to complement the air aspect.
It gives way to a whole new class of planes and also gives players a fun diversion when they're not up to flying but still want to play. I've seen some issues that seem to be regular points of discussion on your boards. To eliminate it causes just as many problems because its elimination creates a perfect but non-real defense to e fighting tactics. This was changed in v1.02. Score structure is something every player wants tailored to their personal style of flying.