Encourage user-generated content

1. Trading Platforms vs Marketplaces (Virtual Economy Gamification Tips)
2. Social Gamification vs Individual Gamification (Player-Centric Gamification Tips)
3. Single-Player Achievements vs Multiplayer Achievements (Gamification Achievement Systems Tips)
4. Rewards vs Incentives (Player-Centric Gamification Tips)
5. Replay Value vs End Game Content (Player-Centric Gamification Tips)
6. Player Status vs Player Reputation (Gamification Player Progression Tips)
7. Player Participation vs Player Contribution (Gamification Achievement Systems Tips)
8. Player Motivation vs Player Engagement (Gamification Player Progression Tips)
9. Player Market vs Game Market (Virtual Economy Gamification Tips)
10. Player Engagement vs Player Involvement (Gamification Achievement Systems Tips)
11. Player Competition vs Player Cooperation (Gamification Player Progression Tips)
12. Inflation Rate vs Deflation Rate (Virtual Economy Gamification Tips)
13. Game Teaser vs Game Trailer (Player-Centric Gamification Tips)
14. Gameplay Elements vs Game Features (Gamification Achievement Systems Tips)
15. Game Modding vs Game Hacking (Player-Centric Gamification Tips)
16. Free-to-Play vs Pay-to-Play (Player-Centric Gamification Tips)
17. Financial Risk vs Gaming Risk (Virtual Economy Gamification Tips)
18. Economic Impact vs Game Impact (Virtual Economy Gamification Tips)
19. Tradable vs Sellable (Virtual Economy Gamification Tips)
20. Consumer vs Producer (Virtual Economy Gamification Tips)