Lucky for them, all they have to do is sign up a few friends for a fresh hit of virtual cash.
MTGox, on which most bitcoin trading takes place, was overwhelmed earlier this week by the amount of people who joined the exchange to trade the virtual cash.
Tuesday's case doesn't involve bitcoin, though the virtual-cash community was watching developments closely.
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"We're thrilled to expand our relationship with Zynga and provide an easy way for players to earn Zynga virtual game cash by learning about Serve and signing up to receive the many benefits of our digital wallet, " said Dan Schulman, President of Enterprise Growth, American Express.
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In certain contests the player who aggregates the most virtual units can win cash prizes.
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As part of the Zynga Serve Rewards phased program, FarmVille players now have the ability to plant an interactive Serve Money Tree in their Farms which will give them the ability to level up in game and earn Zynga Farm Cash for virtual awards redemption.
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But others, currently authorized through a local district but serving hundreds of students who come from other districts, use the establishment of a virtual charter school as a source of cash.
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This means that virtual items acquired within Entropia Universe have a real cash value, and a participant may, at any time, initiate a withdrawal of their accumulated PEDs back into real world currencies according to the fixed exchange rate, minus transaction fees, the minimum amount for a withdrawal is 1000 PED.
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They would apply this "cash out" rule to all sorts of virtual games.
NTT, with bags of cash, a great brand name and a virtual monopoly on local calls, offering customers a one-stop shop.
Cyber-thieves are attempting to cash in on the rising value of the bitcoin virtual currency.
There's "virtual" millions to be won or lost, and even a cash prize for the winner.
Cash is becoming scarcer in a world of debit cards and virtual goods, and peeling off a fresh ten-dollar bill may not be the best way to teach kids the age-old value of a dollar anymore.
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