How many times has it happened to you that you needed an implant, but you had just a handful of credits left, and you couldn't find anyone willing to give you credit anymore? If you ask the right people, they might point out the right nooks and crannies to wait in. No questions, no looks on their faces, just a brief exchange. You may have to clean up the dried blood from the augment later. You can't afford to ask questions about where it came from. But if you've made it that far, it certainly won't be a problem.
Someone has to be wronged. No one is a winner in Chiba Station.
Someone has to perform the draw. It takes knowledge of the subject, analytical skills, knowing how to deal with a possible crisis.
Someone has to lure donors. It takes charisma, dialogue skills, and moving your hands and tongue in synergy with your brain.
Someone has to identify new donors. It takes a good eye, knowing the right people who can sell the right information at the right price.
Someone has to cover the operation. It takes a tightly shut mouth and knowing when to shut someone up.
Someone has to get revenge. As shitty a place as Chiba Station is, surely someone has a sincere friend who can help.
Someone has to soften up the donors. After all, not everyone is a volunteer. So, you just need the right leverage to settle the argument.