Yes, it's true.
Obviously, The cost is impossible cover the expense for the shipping. Why shipping agent quote a low and real price for the sea freight?
Let me explain this case especially in China.
The total shipping cost for sea freight include 3 parts:
1. Cost in the port where your goods is shipped from
2. Shipping cost
3. Cost in the port where your goods is shipped to
So the 1USD/cubic is only for the step 2-shipping cost.You will be charged lots of fee in step 3-when you pick up the goods in the port.
Do you have experience for being charged a large amount when you pick up in the ports? if yes, somebody must have put the fee of step 2 to step 3.