US only sales WHY???

As a UK based audiogon member, i'm constantly surprised at items only being offered to the US, and not worldwide as most ebay items are now, why is this?

After all if the payment is received in full in $USD via Paypal or bankers draft,including the designated shipping fees, what difference does it make to address the item to a non-US address, most items are either picked up by the carrier or taken to the post office and if the seller asks for it to be sent to a foreign address, it takes no more time other than filling out a customs declaration form--Thats It!!, it makes perfect sense to offer worldwide sales and sell items quicker to a [Much Larger] audience.

So the next time that you fill in the for sale details, please give us a chance guys, Thanks!