Rarity
I'll pay you triple! You're throwing away a fortune!

Most parts of the economy honor "rarity", which affects the prices of things. NPC "scavengers" weren't doing so. They are now.

NPC's should now pay less for common things, more for rare things. But good luck locating them, and continue to enjoy low procurement prices when you go to fetch the common ones for them.

Gooooooooooooood.

Where I used the word "common" above, that's economy jargon which means more like "overly common", "too common". I didn't mean to suggest that the default payouts for items which have "normal" or "neutral" rarity will change. They won't.