I´m doing a research, about the most succesfull infoproducts on the making money niche.
Which one do you think of all the history of internet, has sold more units overall?
It can be any infoproduct about making money online, ebay, affilaite, etc... My goal is to study their sales letters and the evoultion over the time, so it can either be a products that was a best seller 10 years ago or last year.
But I´m looking into the ones that sold more units over the time, not jsut big launches of high ticket items that sold million in 2 days and then dissapear.
I will post my conclusions after the reasearch.
Thanks in advance,