The Economy of Iron Missions

Just wondering about the economy of "Iron Missions".

For example for finishing Hunting Challenge: Silver Longtooth you can choose a 93 PED Rifle Skill Implant which has a value of let's say ~1025 PED. If I had a minimum wage job in my country I would earn that in ~10 hours. Killing 6000 Longtooth Old with 1840 HP each would certainly take a little longer. And I can't really see how clicking away the same bunch of pixels 6000 times is more fun than selling burgers or packaging online shop orders for 10 hours.

Actually I'm wondering more and more why people are doing these missions at all?!? Tell me :)