The entreprenuer's role is to bear the cost of creating the product, so he is entitled to get the profits of selling the product. There is no guareentee that the product will be accepted by the market and be successfully sold, so the entrepreneur has to deal with this uncertainty. The role of labor is to create the product, but the entrepreneur already pays labor money to create product(which means entrepreneur will lose money eitherway). He is taking the risk of bringing the product to the market, and whether he can make a profit or not remains an uncertainty. But it is certain he will bear loses from labor costs. To say labor is exploited is not entirely accurate, because there remains the possibility the product will be unsold and entrepreneur lose money to laborers.