Several years ago, I fell for this. What I received was a "newsletter" filled with extremely basic articles. Even worse: Within a month the same articles could be found on their website for free.
"It's tough to make predictions, especially when it involves the future." ~Attributed to many
"In theory, there is no difference between theory and practice. But, in practice, there is." ~(perhaps by) Yogi Berra
"Those who have knowledge, don't predict. Those who predict, don't have knowledge."~ Lau tzu