So really the coin itself isn't the important/interesting thing here anyway, the module is; people could go ahead and use it with real bitcoins instead of mucking around with some obscure newfangled coin, or maybe litecoin or devcoin or whatever if bitcoins are considered "too valuable" for use in games...
-MarkM-
Well, Blindfolded did have a Minecraft server set up with an integrated payment system denominated in LTC. Problem with that was it was right before LTC became valuable. I deposited >1,000 LTC onto the minecraft server, just to find out they would hit a few dollars each in a week or two. After that the server became inactive, because no one wanted to use a coin that was worth that much for game transactions.