Вот что википедия говорит: вкратце, более половины членов ЕС, проголосовали за введение €1 и €2 банкнот, но ЕЦБ не ходит под ЕвроПарламентом и игнорирует эти призывы.
«Italy, Greece, Austria and Slovenia have asked several times to introduce lower denominations of euro notes. The ECB has stated that "printing a €1 note is more expensive (and less durable) than minting a €1 coin". On 18 November 2004 the ECB decided definitively that there was insufficient demand across the Eurozone for very-low-denomination banknotes.
On 25 October 2005, however, more than half of the EU members supported a motion calling on the European Commission and the European Central Bank to recognise the definite need for the introduction of €1 and €2 banknotes.
However the European Central Bank is not directly answerable to the Parliament or the Commission, and has ignored the motion.»