Re: double-opt in list, how big is needed to be effective?
I remember sitting on the balcony of the "club" up at the top of the Westin with Meat and Emmy, while they were talking with a certain someone about doing a mailing to their list promoting the someone's product. Figuring up lows and highs on conversions, profit margin, etc... when they got down to the final guaranteed figure (not the max possible) I nearly choked on my shrimp.
I'd never wanted to risk the hassles of having a mailing list so bad until that moment.
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