[quote]I would say about 600,000. That's still a substantial number for a year and a half after release.[/quote] Do you know what the model destiny is designed around is called? The Skinner box. The main reason people are still playing so heavily is simply because they are addicted. They can't help themselves. The studio also employed employees from blizzard to help them insert elements to make the grind addicting and keep people going for that sweet loot.