More paperwork involved at the post office filling out international customs paperwork. Also postage can vary considerably depending on where something is being sent and I believe that I have read that insurance is not even available for sending items to some countries. All in all some sellers believe it is too much hassle apparently.
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Gear Hubs Owned: Rohloff disc brake, SRAM iM9 disc brake, SRAM P5 freewheel, Sachs Torpedo 3 speed freewheel, NuVinci CVT, Shimano Alfine SG S-501, Sturmey Archer S5-2 Alloy. Other: 83 Colnago Super Record, Univega Via De Oro
Visit and join the Yahoo Geared Hub Bikes group for support and links.
http://groups.yahoo.com/group/Geared_hub_bikes/