Derling was originally a small colony who set up base here 75 years ago. It was soon invaded by traders, miners and other colonists. The original colonists struck a deal with some Bounty Hunters that, in exchange for letting them set up a base there, they would keep a check on the amount of traders and miners who visited there.
This kept a lid on the population increase and the planet remains averagely populated.
In turn the colonists and bounty hunters struck a deal with the Ashar Traders Guild and Megaplex Construction allowing them to set up bases here so the colonists do not have rely as heavily on traders.