The most important feature of a currency is that it be a stable store of value. It is vital for a developing country economy to attract the investment it needs. Even in developed countries, as John Tamny explained here on ,
 http://www.forbesindia.com/article/column/steve-forbes-elephant-in-the-roommoney/40573/1
           ,a stable currency value is the key to investment because those who invest are expecting a stream of future earnings to earn back their investment plus some profit. Instability in currency values mean that an investor cannot accurately predict the value of those future earnings. I think this has become a minus point that some investors hesitate to do their investments in these currencies.