I think they have a purge every so often, just to claw in some cash for the coffers.
Worst one I had recently cost me £12, £8 of which was the Post Offices "Handling Fee".
Import duty is only on items from outside the EU.
And it kicks in at about £18 (circa $30 USD).
They only tend to collect on higher amounts (around £100 declared ) because of the Post Offices extortionate handling fees (£8 charge for you to pay them the money).
Was looking after someones sales box at Prestatyn before last, and there was an Al Williams in there for sale..... there was also one not more that 12 foot away in another sales box...
Arrr.
It be mighty dangerous, wot wi' all the hot fat, boiling pans and such in the Galley.
Wenches aught to ensure they can put a decent crease in a chaps pantaloons before enbarkin on jiggin aroun'.
Yarr.