Some people collect coins and bills - not because they're trying to save for something but because they are simply collecting coins and bills for fun!
My father had such hobby before and even had a wide array of coins and paper bills of different currencies. He had copper, bronze, and silver coins but he didn't have gold coins or the even money to buy gold coins.
We wish he did... because gold is one of the most precious metals and also one of the most expensive. Unlike coin or paper currency, the value of gold is not susceptible to deflation or recession. Its price does not depreciate much and so some people buy gold bullions as investment, or for gold IRA transfers.
If we had money, we would have probably bought gold.