Actually the sentence that everyone keeps saying is a grammar error is IMO a play on the "You aint seen nothing Yet!".
Im sure he didnt want to misquote or use someone elses quote by making an original statement in his newsletter which doesnt hit the masses, just the people subscribed to his newsletter that may either personally know him or have joined due to wanting to hear what he reads.
IMO it was humor to let you know he isnt a robot and that he is a real person.
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