"Euro's worth" or "Euro worth"?

Hi Folks,

I live in Ireland and the unit of currency here is the Euro(€). When the EU created the Euro, it was decided that the plural of Euro would simply be Euro. This was to avoid confusion because different languages in Europe have different ways of changing a word to make it plural.

My query is about apostrophes - yes, that old chestnut. I have noticed that the phrase "Euro worth" occurs regularly in various formats, ranging from TV and radio ad's (I think that apostrophe is correct - "ad" is an abbreviation of advertisement?) to national broadcast news programmes.

This phrase, no matter what the context, strikes me as being wrong. Typical examples are:
"A million Euro worth of goods was seized."
"The man won a hundred Euro worth of vouchers."

So, here is my question: Surely when we are talking about what something is worth using the sentence structure above, " 's " should always be used?
I think (yes, I'm asking for confirmation!) this case falls into the category of possession, that is, "John's hat" is the same situation of possession as "a pound's worth".

Please help, this is bugging me a little!

Thanks.