somethings about virtual coin economics

[blackvoice]

Virtual economies are observed in MUDs and massively multi player online role-playing games (MMORPGs). The largest virtual economies are found in MMORPGs. Virtual economies also exist in life simulation games which may have taken the most radical steps toward linking a virtual economy with the real world. This can be seen, for example, in Second Life's recognition of intellectual property rights for assets created "in-world" by subscribers, and its laissez-faire policy on the buying and selling of Linden Dollars (the world's official currency) for real money on third party websites.[citation needed] Virtual economies can also exist in browser-based Internet games where "real" money can be spent and user-created shops opened, or as a kind of emergent gameplay.

Virtual property is a label that can refer to any resource that is controlled by the powers-that-be, including virtual objects, avatars, or user accounts. The following characteristics may be found in virtual resources in mimicry of tangible property. Note however that it is possible for virtual resources to lack one or more of these characteristics, and they should be interpreted with reasonable flexibility.

[bitebits]

Not really sure where you are getting to, but this is interesting to listen to as well, regarding virtual worlds and their economy:

http://letstalkbitcoin.com/e86-virtual-worlds-real-money/

Adam sits down with Richard Garriott about money, games, cryptocurrency, the intersection between MMO developers and national governments, Valve’s publish-as-a-protocol.

[gagalady]

Yes, it's true that MMORGPs have huge economy too. One of the most popular MMORPGS like "RuneScape" have it's in-game economy but its gold is massively sold for real money. Ever day $10000's are used to buy virtual game gold. Game gold is some kind of virtual currency too because It also have Its rates and value which can be easily sold for FIAT money.