Purpose of savage is:
1. To get better and finish challenges
2. To get glamour
3. To get achievements/ titles
4. To experience the content Normal mode cannot offer
5. To unlock Ultimate
6. To dominate the marketboards with rare item drops that can be used for crafting
7. To gear up your side jobs with those extra stats for next patch
8. To play with friends and kill them have a good time while laughing as you do content together