I noticed that there is a very often situation that when you are low level, you loot some rare magical items like Mushrooms and Eyes, however you actually need Leaves and Powders to make throne progress.
It would be very helpful for low level players to trade their "eyes" for set of leaves and powders.
This is a win win as high level players can get eyes for useless powders and leaves.
The same can apply for traps, money, even orbs or tears.
As per other online games it has positive impact on game experience.
WP 8.1 player