What is the advantage to take a domain name expired in terms of SEO?
This purchase will it help to accelerate the optimization and thus obtain better visibility faster? Can we benefit not only traffic earlier, but also backlinks, PageRank, or even a listing on Dmoz and the length of the field?
Actually not really! It clear that Google ndd loses its expired backlinks and PageRank. It is a pity because given the growing scarcity of words still free access to file a new domain name, it would have been handy!
So even if the ndd has many external links in a theme consistent with the new site, they will bring visitors, but no advantage for engine placement. Will be starting out at zero at referencing!
But it is different when buying a ndd which has not yet expired, but the price will not be the same, especially if it enjoys a good popularity! See for example the trading platform online sale / purchase of domain names Sedo or even a website explaining the domaining with numerous addresses of specialized forums.
In conclusion, the only advantage is being able to recover the traffic area immediately, if and only if the new site is written in the same language and most have a theme close to the former. Also it is good to check the history of the area and particularly its past environment (connections, neighborhood, etc.) to avoid penalty. Web.archive.org is a true journey back in time and lets see Older versions of a site or domain. To discover the sites and domain pending expiration tool: Dropscout is very convenient.