Not really an answer to the question about a more diverse product line generating more revenues but I really didn't expect one in the first place. Keep focusing on the amount of business cards that EI collected at their first convention and I will continue to watch for new products. "I think" that the new products will produce more revenues than the cards did and you can "know" whatever it is that you "think" you "know.
I guess it is just a lot easier to look at the past than to think of ways that the company can improve itself in the present.
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