Dogs of the dow

[Hklm8383]

Sorry if this is not the right forum. I used search and i could not find a topic on the subject.

So my best friend father invested like 100k in the dog of the dow and he keep telling me how good it is and stuff. He tell me it is so safe and blabla.

here is a quote from the website :

Looking for a simple way to select high dividend yield Dow stocks for your investment portfolio? Try Dogs of the Dow. Read on and you will discover a technique that would have given you a 17.7% average annual return since 1973!

http://www.dogsofthedow.com/

Now i am asking myself how something supposely that simple could be so lucrative on the long run and why isnt everyone doing it. So here is my question. Is that stuff safe and anyone doing it ? thx for the help.