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That reminds me of one typical sports-betting trick that was used in the past (and I suppose it is still used in different ways)...

The trick was to send for example 1000 emails with the "prediction" of the match, saying how you have insider information about the result... You send 500 that the 1st team will win and 500 that the 2nd team will win...

After the match, you send 500 emails (those which were right, the other 500 you kick in the trash) with the same pattern 250-250...

You continue doing it until the 10-20 emails... as people who receive the emails will see how you get the result EVERY time, they will really think that you KNOW something, and BUY your offer for signals, or whatever you are selling... 😃