HAIKOU, Nov. 14 (Xinhua) — Wang Chuanshu enjoys going door to door in his hometown to collect local farm products and help sell them via e-commerce platform. The 42-year-old Wang from Changxi Village of Jiazi Township in Haikou, capital of south China's Hainan Province, has earned the nickname "rural buyer" for his unique work. People in Jiazi make a living through rubber plantation, vegetable and sweet lime fruit farming, livestock rearing, among others. Earlier, locals like Wang could hardly sell their agricultural products outside their hometown due to low yield and the region's remote location. But, that's a thing of…