Hi, I'm probably missing something here. According to [JKCPCB FAQ](https://support.jlcpcb.com/article/41-pcb-fabrication-services), **10 pcs** of 2 layer PCB cost **2$**, while **100 pcs** cost **80.38$**. Suppose I want to make 100 pcs. I would better buy 10 x 10pcs, and pay 20$ instead of 80$! (assuming they are sent together so delivery is paid once) How does it make sense?