5 reasons gold is headed for $3,000

``Unlike a stock, gold has no earnings or cash flow. So how do you decide if it's overvalued? By comparing its value to common benchmarks. And by several comparisons, gold still looks cheap. Gold would have to hit $6,400 an ounce for it to match its value relative to the Standard & Poor's 500 Index when it was at highs in 1980, points out Lewis'' -- Some good mining picks are mentioned in this.