I am a rather gray-hat affiliate marketer by trade, but I"m looking more into going into local SEO and blogging ventures that I feel will be most sustainable. I am having serious moral issues with using any of my link building strategies, but the one I'm struggling morally and long-term strategy-wise is the use of a manufactured link-juice-flowing-thick private blog network. I believe the majority of these will ultimately fall by the wayside in the future when their social value and content are proven to lack substance by machine reading and advanced social metrics. 
A brand new domain, for instance, will have to wait for a few days before getting indexed by Google and other search engines, and then its owner will need to go through the tedious process of search engine optimization, which takes time and financial resources. High authority expired domain names on the other hand, offer a short cut and allow you to get down to business straight away.
We do not only have Expired Domains, but you can also find lists of Deleted Domains for a lot of TLDs. Deleted Domains or Dropped Domains are available for registration and can be picked up for just the normal regfee at your preferred domain registrar! All Domains have the typical SEO relevant data, like Number of Backlinks, Archive.org Birth Date and a lot more.