So basically it all depends on whether or not the game master wants to include ships in their event. If you didn't know already, ships cause a lot of lag and can crash the server very easily. Although they may be fun for the few times they are used, spawning in a ship(s) for pilots would mean that the game master would have to spawn in less droids to compensate for the lag. Basically it's a trade tacking from one department in order to give to another. Also, the game master would need someone to manage/supervise the ships in the air if they choose to include that in their event. Because of this, it is up to the game master to decide whether or not they want to include people flying ships in their event. Bottom line is, yes ships are fun, yes they cause a lot of lag, and if the server crashes because of a game master having a bunch of ships flying around they are held responsible hence the rarity of ships being used outside of transportation.