Subscription-based services

1. In-Game Purchases vs Microtransactions (Player-Centric Gamification Tips)
2. Digital Economy vs Virtual Economy (Virtual Economy Gamification Tips)
3. Exchange Rate vs Conversion Rate (Virtual Economy Gamification Tips)
4. Subscription Model vs Freemium Model (Player-Centric Gamification Tips)
5. Game Revenue vs Virtual Revenue (Virtual Economy Gamification Tips)
6. Monetization Strategy vs Revenue Model (Virtual Economy Gamification Tips)