Rob Fahey

“Love your freeloaders, and they’ll love you back. Some of them will like what you do so much that they’ll become paying customers. Some will even become whales. Some of them will invite their friends to come and play - which has a direct financial upside for you, because it reduces your acquisition cost. Some will play with their friends in the game, which boosts your retention and makes those friends more likely to keep playing and become paying customers. Some will spread the word about how fun your game is. They’ll all bring you value in their own way. Of course, that doesn’t”
― Rob Fahey, Design Rules for Free-to-Play Games