15. Contrast & Comparison Free Download SKU Free-to-Play/Upgrade to Premium Virtual Land & Item Sales Merchandising (Webkinz) Retail SKU Monthly Fee Free-to-Play/Upgrade to Premium Virtual Item Sales Business Models Social Space Game
16. 2007 Free Download SKU Free-to-Play/Upgrade to Premium Virtual Land Sales Virtual Item Sales 10% of Market Exp: Runescape, Iron Realms Retail SKU Monthly Fee 90% of Market Exp: WoW, EverQuest II Business Models Boutique/Web Game Premium Game
17. The Transition: 2012 Free Download Free-to-Play/Upgrade to Premium Virtual Land & Item Sales 40% of Market Retail SKU Monthly Fee 60% of Market Business Models Boutique/Web Game Premium MMOs