I heard in one of your most recent Live Chats about how you currently intend to charge X amount for player housing. Which I would assume would also include things like player run shops etc. If you are going to do this you might consider that some people are always going to sell in game items for cash. It would probably be in everyone's best interest to have a way to sell goods for cash within the framework of your game. People who own shops could have items up for sale in their shop at a Gold Price and also have it listed for a Real World Value. Like 2000 Gold for a Suit of armor or $5 Dollars and of course the "Game" could tax that amount in addition to what say paypal would charge for said transaction. If you put it in place from the start there will be less of these websites trying to scam people to use their service to buy and sell items. Instead you will have a source of income that would otherwise be a kind of black market only. You know people will pay for digital items, I'm not saying have loads of micro transactions for items from your company; however between players is a whole other matter and might as well be allowed. If you don't put your own mechanism in place for this someone else will. It would be better for your company to facilitate it in a legal way and gain profit from it rather than it devolve into a number of shady websites. It would potentially also encourage others, to rent those more expensive pieces of real estate to sell their goods from as well. You could also have the deeds of such locations sold for real currency, and take your percentage from that as well. I've heard stories in the past of people paying upwards of $5000 Dollars for things in various video games. You might as well setup a system that could facilitate it, since it will be there anyways.