Consider using narrative...

Source type: 
Own Experience
Consider using narrative as an reward in place of giving it away or using it only give the player sense of progression. Offered in pieces, the narrative can be "leaked" out sequence if desired and can perk the player's curiosity.
Reference: 
Micah Hrehovcsik, Senior Lecturer, HKU: University of the Arts Utrecht, 8 yrs
Player response: 
Curiosity
Gratification emerging from rewards
Game design features: 
Narrative
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Added by: Micah Hrehovcsik, Senior Lecturer / Game Design Researcher