because printing too much money will affect the value of the currency and will be on the social life of the people in the country
It even counters your mind as well that why a country dont print as much as money as it can. Machines are there and you have got enough people to help you out to print that money. Then why they shout for inflation and why there is scarcity of money. But according to internationals laws and standards, a country is eligible or allowed to print as much money as it has reservoirs of gold.