Let me elaborate just to show you how leaving something like that untouched can screw up an economy.
Lineage II had a quest called the grim collector that was available all through open beta. It was the highest money-paying quest at the time, since it required you to collect pieces of a skeleton, put the skeleton together and then give it to this guy. L2 had massive lag spikes during open beta, and someone eventually figured out that if you timed it right the server would register you completing the quest multiple times (even though it's supposed to be a one-time quest). So what clans (and some RMT) did was gather people for the quest and using the lag exploit turn themselves into millionaires. If memory serves, it was something like 22K adena for the turn in, and could be registered by the server as much as 9 or 10 times because of the lag. NC Soft did nothing about the people who exploited the quest, and left everything untouched when the game launched. The result was that the economy was borked from the very beginning, with with prices for everything in then hundreds of thousands (and eventually climbed to millions). NC eventually took the quest offline for a long time, but the damage was done.