Over this 12 month period she spent $1,500 and purchased 40.11 oz of Amark silver rounds.
If instead she had just purchased $1,500 in Amark rounds on June 1st, 2011 (at the price then of $42.32 per ounce) she would have 35.44 oz of silver (if we could actually sell 0.44 oz that is).
As 40.11 less 35.44 is 4.67 oz, or 13.17% more silver.
There are more references online that attempt to show the advantages of dollar cost averaging, as well as a lot that try to argue it is overrated. Certainly for something that constantly goes up that is true, but volatility is your friend with dollar-cost-average investing.
I hope this real-world example has shown you how it can make a difference, and has significant advantages for investing in precious metals.
Now, don't you want to go to the Gold Purchase Plan or Silver Purchase Plan page and sign up?