The bandit army controls the materials entering and leaving Mars like a faucet, hiding stealthily on one side, eating in and selling out, which is extremely pleasant. The items the bandit army wants to sell usually have very few permits issued, and are in high demand. As for those they wish to buy, Old Klaus has countless traders under him who can suppress prices to the lowest point within minutes.
Of course, Old Klaus usually does not employ such a golden-finger-esque trading method.
Firstly, the old fox feels this doesn't showcase his capabilities, and secondly, as that Leray fatty says, to catch fish, one naturally needs to raise fish first; it's best to avoid killing the chicken to get the egg.
