They are quite profitable. Think of it this way: that you are someone who knows nothing about the export and import industry. Goods need to be transported to the seaport, but you would not have any idea about the shipment or customs procedures.
In this case, delays are losses are expected for your business. However, to free yourself from this frustrating situation, hire a Chinese shipping agent. They ensure that procedures for shipment are smooth and are on time. This helps to increase your profit, as your shipment is likely to arrive on time. They will also save you from various scammers during the shipment procedures.