I think that the game would benefit from having things like Infinite Elixirs for PvE. We could grind the pieces in several spots and take advantage of materials/spots that currently are irrelevant for the game. Would be nice if it was similar to the currently pity piece system, with a very small chance to a raw drop.
For lifeskilling a Infinite Energy Potion could be made, that could recover energy only when active gathering or something, to prevent abuse.
Other ideas would be something like Infinite Beer to give to workers, Infinite Food to feed pets, Infinite durability for alchemy and cooking utensils, etc
They had the idea for infinite elixirs and scrapped it. I think they ditched it because of complaints of elixir use in t1 nws and how it would affect the economy.
They can add restrictions to nodewars and make it unsellable on marketplce.