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.

3. Email converts better. People who buy products marketed through email spend 138% more than those who do not receive email offers. In fact, email marketing has an ROI of 3800%. That’s huge! And if you are wondering if social media converts even better, think again: the average order value of an email is at least three times higher than that of social media.
"Why aren't millennials moving?" The subject line of this email campaign reads before citing interesting data about relocation trends in the U.S. Trulia doesn't benefit from people who choose not to move, but the company does benefit from having its fingers on the pulse of the industry -- and showing it cares which way the real estate winds are blowing.
Make the first three sentences of your blast catchy. The first couple of sentences within your email blast will determine whether the recipient decides to read the rest of it. The intro should draw people in with a sense of urgency or excitement. You can elaborate more on the subject line within your first sentence to give additional clarity to what the email is about, or you can create a sense of urgency and intrigue that compels them to open the email to learn more about the issue.[4]
Establishment of customer exclusivity: A list of customers and customer's details should be kept on a database for follow up and selected customers can be sent selected offers and promotions of deals related to the customer's previous buyer behaviour. This is effective in digital marketing as it allows organisations to build up loyalty over email.[22]
Content marketing is more than just blogging. When executed correctly, content including articles, guides (like this one), webinars, and videos can be powerful growth drivers for your business. Focus on building trust and producing amazing quality. And most of all, make sure that you’re capturing the right metrics. Create content to generate ROI. Measure the right results. This chapter will teach you how.
Particular groups of customers can be targeted or even individuals. Offering individual customers special deals on merchandise and/or services on the customer's birthday, for instance, is one example of email marketing personalization. (A restaurant might send an email to customers on their birthday offering 50% off an entree,) Email marketing helps a business develop and maintain a relationship with a customer over time that hopefully results in increased sales and increased customer loyalty. 
It's practically impossible to overstate the importance of direct mailing lists to the success of your direct mail program. The correct mailing list will contain your most valuable prospects. The more careful you are in analyzing and selecting direct mailing lists, the better your chances for success. There are several different categories of mailing lists available on the market today ranging in cost and appropriateness for your market. When you are considering what type of mailing list to buy consider the following three types: 
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