Originally Posted by PR-Giants
Cost could and usually does include all charges to the Shipping Port, but neither the seller nor the buyer know the charges after it arrives in the Port of Entry. Many fees are daily charges and the release date is unknown until it's released. When adding $100, $50, and $35 daily fees, to list a few, they can add up quickly. Some daily fees have a short grace period, but never enough.
Some fees didn't exist when the Ship left, but did before it arrived.
Sounds like a lot of hassle, which is probably why there are a lot of customs brokers in the produce industry. You can't really have a container of produce sit at the port for very long.