There are economic truth in what Egonomics is saying. When the game mechanics drains more money than it generates, the economy will experience deflation, which is bad. Can't say much about the income level at cap...but let say at cap there is little to no money generating mechanics to outweigh the repair cost, then the community will have to be self sufficient in relying on other crafters to repair, or that the money generated from earlier quest is so great that it will last for a long time. Even then, AH sinks a portion of your money away. This guy knows his economics.