The goal of D&D is to be able to retire your character from adventuring at some point. Stock piling would be something a character would want to do to be able to sell those items in a shop or such that the player owns. I don't see this hurting the players.
On page 37-38, Horn Tusk Armor doesn't make sense.
Horn Tusk Armor
Armor (hide), uncommon
If you fall to 0 hit points and don't instantly while wearing this armor and not incapacitated, you can use your reaction to make a single melee weapon attack.