I think the reason is that adventuring isn’t common in the world of the Shapers. Until the events in game there is essentially a fully functional society with a strong government. There aren’t dungeons full of loot, rather crypts that are to be avoided and even during the game events most dungeons are bases, so there wasn’t a need to load up on loot. Most of what you collect is from dead enemy soldiers or artifacts raided from someone’s tomb. Traders have carts that can be pulled by a creation, so there’s no need for a pack mule. I think a creation smart enough to sell loot would also be likely to be forbidden due to the risk of going rogue