I subscribe to DnD and Ive seen several recommendations jump by 30-50% on opening after theres been a buy recommendation the previous night.
Now that gets me worried, the people writing a popular newsletter are in a position to make millions if they gain a following. they can invest in their own recommendations the days prior to the newsletter then sell after the price leaps up.
The DnD author does say he doesnt invest in his own tips, but whos to say his son or neighbour isnt in on the deal for him??
If I had an early copy of a tip off like the DnD ones, I know I could make a lot of money...