Cox has had far more dogs than winners. If I were to do a Cox style newsletter it would work something like this. I'd pick a bunch of cheap pink sheet and OTC stocks using a roulette wheel, rejecting only those companies that are obvious frauds. Then I'd write up long articles about why the selected stocks are cool.
Later, I'd brag in my advertising about the 20% of those stocks that doubled. As for the 80% that went to zero, I'd say you should have done your own due diligence.