Why do Pkers in Bounty Hunter leave the Crater that they are in right after they kill a non-targeted person? Are you able to come back in without a penalty and pickup the items or what? If someone could give me the used method that would be great =)

They go and restock on supplies, or change armour sometimes.

They go and restock on supplies, or change armour sometimes.

 

and then they go back in and get the loot?

Yea, when they come back, they have a new set of potions to withstand anyone trying to kill them

Its usually to get sara brews and better armor to wait out the 180 second penalty.