“We’re always giving people the option to join our email list when they come into the spa, but we just recently added the option for people to sign up when they visit our website,” explains Christine Copertino, spa director for Allegria Spa. “The response has been great. We’re seeing a ton of people signing up, and we know that these are really engaged people who will be excited to receive our emails.”
I think what Brian and the testers are missing is that 15k is neither big enough to be impressive nor small enough to be inviting. It’s not a number that works effectively as social proof, and while I can’t test it out myself, I believe, based on evidence for social proof around the web, that DIYthemes would have had much better success with a combined number in the 50k+ range as mentioned above.
One often overlooked strategy for list building is to step outside of your immediate market, and get known in new verticals. Take for example, my list building advice: it works for bloggers, but it can also work for photographers, dentists, and jewelry designers. I’ve been able to repurpose my content and do short focused bursts of list building in these different markets.

You can use this strategy to your advantage and increase your email list by giving people an incentive in return for their email. The giveaway could be free access to an e-book, a report, a gift hamper, or perhaps a lucky draw where people enter their emails and get a chance to win. A tantalizing offer is all you need for people to comply. For example:
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