The main benefit of a gold backed crypto currency is that it ensures a relatively low level of inflation.
Inflation is caused by a combination of four factors:
1.The supply of money goes up.
2.The supply of goods goes down.
3.Demand for money goes down.
4.Demand for goods goes up.

So long as the supply of gold does not change too quickly, then the supply of money will stay relatively stable. That is why Goldma is needed.It is a stable gold backed currency!