just to add more to the thread to bump
Online gaming/gambling is worth about 15 billion / year in profit at the moment with more room to grow especially in europe, south america and asia. Mobile gaming has been slow to grow just like adult but is now getting off the ground.
http://www.economywatch.com/world-in...-industry.html
Mentions the industry is worth 20 to 50 billion in revenue right now
Another article that discusses some older figures:
http://answers.google.com/answers/threadview?id=505643
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