I think the topic poster is asking why the price tag changes. For example, the topic poster posted a chart and assigned 200 pins to download it. The chart gets approved by the mods but the price is 130.
Is that what you're asking, @xstitcher1398?
The system takes tax too, which if I may so say, a bit unfair.
So you lose a percentage of whatever you choose as pin/coin.
I haven't been here long, but its easy to see how the system works.