I mean...you sort of need to butcher trolls right where you kill them, since part of the butchering is making sure they don't regenerate and get up and kill you. So...they'd need to travel right with us, which has big logistical issues.
But also, my main point is (and has basically always been) more that with them all over we need to travel a sizeable distance for every troll we kill, which makes the money we are paid per troll look a lot worse.
Maybe, but the reason I bring this up is not just because the bounty for trolls is 5gc, but because I think there are other tangible and intangible benefits that can be earned apart from the bounty.
I can think of two off the top of my head
1.Selling the byproducts themselves
A normal human can't even kill 1 or 2 trolls in a group without being an expert, and that naturally means that the supply of byproducts is low, which means that the price of byproducts can be high, so the price of byproducts can be higher than the bounty for trolls.
2. tangible and intangible favors from hunting
I think the increased bounty means that either the situation has worsened or there are fewer or no groups willing to do the mission. This means that we can gain favor or goodwill from various groups or people if we do it, which will help us in the future gameplay.
For example, if we can outfit the Unblooded with Troll Leather Armor or Leather Brigandine Armor using Troll hides, will there be a bonus in the negotiation process or trade with tanneries and armorers?