Why do people invest in gold coins?

Why do people invest in gold coins?
For the last four years stock market in Karachi is doing down. Investors have started pulling out their money from the market because of sluggish economy and violence in the city. Some investors have started buying gold coins.
I would like to tell my blog readers that gold market is also risky. One should buy gold coins backed  by governments. Most people  recommend American Eagle gold coins. Recent market reports indicate that its sales reached  131,000 coins in November. Markets analysts say that fiscal cliff has pushed the sale of gold coins.