As a means of getting rare ingredients into the hands of crafters, and in keeping with the post-apocalyptic them, have random satellites fall and crash into the ground.
These would have smoke emanating from them, which could be seen from afar. There would be a mad dash to get there, get stuff, and leave before groups came to seize the prize. Definitely a reason to PvP.
Add meteors for a false positive. You wouldn't know until you get there. Then you could allow it to happen more often, and people could make a profession of sorts out of it. Satellite Chasers!