This is not a plugin or anything of the sort but more of something kinda fun and money smarts in a way. A new currency of paper, renamed as a certain amount. Then used to purchase things. in other words Dorrah The Mods could be the government ;D
(http://i2.kym-cdn.com/entries/icons/square/000/002/252/me-gusta.jpg)
No.... You've been listening to the staff talk way too much. The currency system already running does not require a slot in your inventory and requires no effort from anyone but the person making money. And the server is setup for the currency system there. also adding physical currency would make certain pluggins useless such as Trade.