Market Place
For example, you can buy a ricky scroll in shop for 20 EL, but only sell for 7 EL. If the house (the game) is looking for one badly, it will enlist in market place and pay 15 EL for one.
The market can pay for an item or monster for silver coin, essence of life, essence of wisdom, and some rare occasion, boss essence or gold coins.
All items including monster can be listed in the market.
This can be done 2 ways -
1. Individual market place - One day every week. 6 items will be listed and everyone can sell those 6 for better return.
2. global market place - everyone sees the same market. It is always active. Only 1 or 2 items will be listed at any time and renew every hour. Who ever sells first to the market gets the reward (but new item inquiries will be posted every hour).