“Jip” is phonetically identical to a slur that refers to ripping someone off, so I was curious about what you meant and found this forum post that goes into detail. Kind of fascinating to think of the incentives and how they play out.
This person seems to leave out some info. A previous coworker spent some time as GC employee. He would tell stories of each month's jip awards to the employees that brought in the most jip. There's the price on the sticker, and then there's the absolute lowest price GC will sell for. As the comment in that thread suggests, buying from GC is something to not be done without researching first. Similar to buying a car
How many times have I heard, "you know, since you're a cool dude, I can knock off X% for you"? Every. Single. Time.