Purchased lists are ineffective, and they impact everyone else who uses Mailchimp, too. If you send emails to a list of people whose contact info you bought, many of the emails will get identified as spam. Some spam filters will flag a campaign if anyone with the same IP has sent spam in the past. When you use Mailchimp, your email is delivered through our servers, so if one person sends spam, it could prevent other users’ emails from reaching inboxes. But by forbidding Mailchimp users from using purchased lists, we increase deliverability for everyone.
With marketing automation in place, it’s tempting to “set it and forget it” when it comes to email marketing. But, just like life, what you get from email marketing depends on what you put into it. The best way to maximize your gains is to pair a great marketing automation system with a robust email marketing strategy that reflects your customers’ needs and the buyer journey.
Based on all the information we have gathered during our in-depth research we assign a magic score to each vendor. This is based on factors that affect any solo ad purchase (for e.g: CPC, Sales, Conversion rate etc). We use our proprietary algorithm to do this. As a rule of thumb, higher the Magic Score, better the solo ad experience is going to be. 

That isn’t to say that sales-y promotions couldn’t ever create results—as marketing “gurus” have proved. The results just aren’t as good as they could be. Take the biggest gurus’ results—the ones they boast about—and calculate their conversion rates. Often their marketing is comparatively ineffective. They just have massive volume, so the sales numbers are impressive. 
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