Is DMOZ link still valuable?

In this post I would like to write about importance and difficulty to gain link from DMOZ directory. Many of us are trying to gain this back link. And most of us are unsuccessful. Why?
Owner of ODP project DMOZ was Netscape Division. It was founded in 1998. In the past importance of DMOZ listing was axiom. All main Search engines as Netscape Search, AOL Search, Google, Lycos, HotBot, DirectHit, and hundreds of others used data from DMOZ as source for their results. You can see it on next picture:

But in January 2007 situation changed as you can see on next chart:

As you can see DMOZ as source for main search engine disappears. Why?
After system failure and editing outage from October to December 2006, DMOZ shows only older version of data in catalog. DMOZ has also problem with corruptive editors. It is not surprising. Editors are spammed with tons of submits, and possibility to earn some money for their services is very seductive. After ignoring DMOZ as source for search engine, importance of DMOZ decreased. But is link from DMOZ still important? It is not important for SERP, but it has historical value. Presence in DMOZ has for webmaster meaning. It is mark of "domain quality", because domain was approved in DMOZ directory. Especially while selling domain, presence in DMOZ can increase domain price. And how to gain it. Nobody knows. While submitting it is important read carefully all rules. And once, maybe, your page will be in DMOZ results.

Sources:
Search engine relationships chart
Bruce Clay™, Inc