Hi Jared,
The comments below are correct. Moz's index isn't a complete view of the web, but we try to crawl quality sites out there. Our index is always growing. But to be frank, no one -- not even Google -- crawls the entire web. There are just too many pages out there and computing power is expensive.
We focus on quality sites because we believe (and hope) our customers and community are focusing on high quality links that are still active, which are going to give them the best SEO results. (Also a huge part of the web is just spam nonsense.) Many SEOs -- and I include myself here -- will use multiple sources of link indexing for the broadest view of the web and their sites. I use Moz's OSE and Google Webmaster Tools (free and big, but includes lots of spam, which can be great if you're fighting a Penguin penalty). Others will use OSE, GWT, and OSE competitors like Majestic and Ahrefs, especially if link building is huge for them and they want to account for every penny. Every index is a bit different.
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