Hi,
Actually, we don’t make any profit on the most common sizes, like 5cm5cm and 10cm10cm. We do so is hoping to make the DIY affordable for the community. We don’t hire any chirld labor. Every Seeed stuff get a good pay. 
We plan to shoot a series of veidos to let you guys know more about us and Shenzhen, where Seeed located. Keep eyes on~