In order to maximize profits, but in the case of incomplete information, the market demand faced by manufacturers is uncertain, so the long-term survival method of manufacturers is to maximize sales revenue or market sales share.
Moreover, although it is cheap to get goods from the source, in the absence of popularity and sales channels in the early stage, most of the source factories will help them sell their products through dealers, so the price will rise with the profits earned by labor, transportation, publicity and dealers! However, in today's network society, people can get goods directly at ex-factory price, eliminating middlemen, and the price is relatively cheap.