Specimens Worth Less Than Issued Notes?

Specimens cost nothing to the issuing authority, because they have no spending power. They could be issued just for a few gifts, to distribute to banks, to give away in a marketing campaign, to sell as trinkets, etc. Your understanding of only 10 or so issued is very wrong, if used as a general statement about all specimens from all countries. You'd need to know the specific number issued for this particular banknote, as well as supply/demand, how many are extant, etc, to get a handle on pricing these particular ones.

Dave

After WWII the Czech National Bank perforated all remaining notes from Bohemia and Moravia as well as the notes from Slovakia with "SPECIMEN" to sell them to collectors. But you also find notes perforated "NEPLATNE". The last perforation indicates real specimens made for banks. These NEPLATNE-notes are much more expensive and very rare. What is very interesting is the fact that there were also German banknotes perforated "SPECIMEN" and some notes from the ghetto Theresienstadt by the Czechs. There are just four! perforated notes of the following type known to me: