Forecasting and Analyzing Digital Entertainment (FADE) who is a market research firm that produces monthly and annual reports for bunch of gaming markets such as Steam, Xbox Live Arcade, PlayStation Network, WiiWare & Virtual Console and mobile markets - Valve pulled in an estimated revenue of US$970 million in 2010.

Benjamin Schlichter, Director of Research and Analysis said "Steam's growth has been remarkable during the year. Over 180 titles were estimated reaching over $1 million USD in revenue for the year, painting a very healthy market for developers and publishers, with more room for growth in the future."

Below is a list of the top selling games on Steam for 2010:

Call of Duty: Black Ops (Activision) - $98.2 Million USD

Call of Duty: Modern Warfare 2 (Activision) - $39.4 Million USD

Left 4 Dead 2 (Valve) - $36.0 Million USD

Battlefield: Bad Company 2 (Electronic Arts) - $25.4 Million USD

Sid Meier's Civilization V (2K Games) - $21.9 Million USD

Portal (Valve) - $20.0 Million USD

Fallout: New Vegas (Bethesda Softworks) - $17.0 Million USD

Metro 2033 (THQ) - $13.4 Million USD

Mafia II (2K Games) - $11.9 Million USD

Warhammer 40,000: Dawn of War II: Chaos Rising (THQ) - $10.8 Million USD