I should say - yet. I think it is based on the value of the item and how it is shipped (for the US)
For those in the states, I found this information on another blog...
The buyer is responsible for paying customs duties, if any.
In general, packages with a value of less than US$200 will not require any duty charges.
If multiple packages from the same location are received in the same day, the value will be summed and duties are owed if the value is over US$200.
Imported package under US$2000 entering the country through International Mail enter as Informal Entry and all paperwork and the USPS and Customs Service can handle processing.
Sending Goods to the United States
Shipping through International Mail Services (like La Poste) and then through U.S. mail, including parcel post, is a cost-efficient way to send packages to the United States. The Postal Service sends all foreign mail shipments to Customs for examination. Customs then returns packages that don't require duty to the Postal Service, which sends them to a local post office for delivery. The local post office delivers them without charging any additional postage, handling costs, or other fees.