Some FATE oddities I've noticed

1. Is there any particular reason why I sometimes see people bring their level 40 alts to Heavensward areas? I know most crystal parties include leveling, but what's the purpose of bringing a job along that can get one or two-shot everytime a mob sneezes? Also, don't they get a experience nerf for doing FATEs that low?

2. If I'm level 59 in a Churning Mists FATE that syncs me down to level 58, I get unsynced (and thus unable to attack targets) if I stray outside of the FATE area. But someone that's level 58 (or lower) can easily camp outside the FATE area where the mobs spawn and kill them before they enter the zone. Is this working as intended?

3. How does FATE contribution work? I've fought boss FATEs before where I've been present and attacking for the whole FATE and still end up with silver. On a related note, how does contribution work for multi-mob FATEs and item gathering FATEs?