The Secret Shop of Na'Un.

The more juicy the Secret the more it weighs. The better the Secret the more it fills the Jar. 
* 25% or less is not worth much, 10 silver at best. Secrets of this nature are stealing an apple when you were hungry, cheating at a friendly game of chance, having a crush on someone.
* 50% or less are worth a bit more, up to 5 gold. Secrets of this nature are stealing money from a merchant, cheating at a gambling house, loving a friend's wife or husband.
* 75% or less is worth quite a bit more than others. They earn the player up to 100 gold or a random uncommon magic item. Secrets of this nature include murdering someone to rob them, cheating clergy or a town out of money they needed for food, killing another person to have a chance at the love of your life.
* Should a secret be so potent that they fill the vial they will earn themselves either 100 platinum or a random rare or very rare item. These secrets are incredibly rare and require an unthinkable secret.