Why would a sovereign state choose an exchange rate peg over the demonetization of the local currency, replaced by hard currency?
In the case of the West and Central African CFA Francs, France has an obligation to support the peg to the Euro. Would it not be more advantageous for both parties to facilitate the distribution of Euros throughout the CFA Franc area instead?
Considering Ecuador's and Zimbabwe's experiences, it would appear demonetization is the end result of very dramatic currency crises and never really a choice. But it seems to have all the advantages of a peg (stability, trade facilitation, etc) without any of the disadvantages (currency speculators, need to maintain reserves, etc).
What am I missing here?
EDIT
A brief description from Wikipedia of the conditions in Ecuador leading up to the official adoption of the USD in 2000.
And for Zimbabwe, an article from the BBC describing the well-known hyperinflation the country suffered through before abandoning it's currency.
There are a few more links I wanted to include, but unfortunately my rep is too low.