All of them are correct.
Worn circulated coins are mostly metal value one of them is copper and bronzed for their are not that many collector in EU as like US that the market is so bullish, the research and study of their coin is so updated the every denomination and era have a book.
Seen some pre-euro coins in EU have good value mostly france and their is some rarity to other countries but I'm concentrating on Ireland and GB where coin source is easy to achive because I'm base here and they are out in circulation so building a collection in good grade is quite expensive and still their is a question of cleaned EU coins for EU collector just an opinion have mostly cleaned their coins and for the US collector it has a less appeal if it is cleaned, so I go for low grade for now,
Seen some coin in coinshop others days they are their but others they are gone, not on common date of greece and france they are always their if it is not common the dealer and the buyer already taken them out ,I dont want to start going to other countries for now to start a new series only if I completed Ireland and GB from 1900 to present.
But on the series of two countries the denomination that is quite hard to find is farthing even in low grade their whereabout is still in question even british colletor have found difficulty or they dont have that much hoard in their stock for coinshop also come short but not
ebay or internet that may goes to other smallest denomination in other pre euro countries.
One of the metal thats not have the same phenomena as US is silver and gold for pre euro coins or EU, seen one of the thread discussing it.
As US have many books about their coins the Pre-Euro coins for me is open for new discovery even the variety and errors or new find that is not listed in other references or in parallel or reference from US book other countries can do the same a new find and attribution they cannot erased it to the record if the priced is the kicker on the end what ever will come if they find one for pre euro are out in circulation and the hunt for new one is for me harder.
Till now didnt seen a book about ireland its varieties a comprehensive one it may also goes to other pre euro countries.
As always low mintage high grade is the key or rarity for supply and demand priced follow for me.