This reminds me of an old stock tip scam. A scammer would mail a large number of stock tip letters, 50% claiming that the market would move up the following wee

This reminds me of an old stock tip scam. A scammer would mail a large number of stock tip letters, 50% claiming that the market would move up the following week and 50% claiming that it would go down. The scammer would then repeat this each week, but would only send new batches to the people who had gotten the letters that had the correct "prediction" the previous week. After a while, some people would believe in the scam letters, as so many of them had "predicted" the market correctly. Falling for the scam, those people would send large sums of money to continue to receive the stock tips, leaving the scammers rich.