Here is the Strange Phenomenon I noticed and its story:
I am running a business website for the last 4 years (Adsense publisher) and started it from scratch. Through time I understood that "Content IS the King" but as well the importance of SEO so tried to satisfy both of them. I finally achieved a PR6 one year ago after much hard work, 15,000 unique pages of pure content and hundreds of quality backlinks (!). Now the site is top listed in G for my main keyword.
2 years ago I decided to register another domain with my keyword separated by a hyphen (eg. www.keyword-oneword.com) just because I thought that hyphen-separated domains were very useful that time (and still think it was!). I copied some articles from my main site and built a very simple template, resulting in an amateur website with about 40 pages.
I published also a banner ad to my website (in order to take advantage of the backlinks, Now I know how dangerous this may be!) and left the website in its destiny... About 4 months later I achieved also a DMOZ listing within the same category that my main site was already listed. The PR of my website was 5 (just because of the DMOZ listing!) and it was kept stable until recently (strange also?).
From that time I just added about 10 pages of content one time several months ago and "forgot" the site again.
Yesterday - after 2-3 months of not even visiting it - I thought I should take a quick look at the "forgotten" website and was really surprised to notice that its PR got 6 (!).
I thought it would be useful to share this really strange phenomenon with you as this means that a dead website has the same PR with a daily updated unique-content website with 15,000 pages and hundreds of backlinks...
I don't know what to think but maybe I should start building simple amateur websites, listing them in a PR5 DMOZ category and then just... forget them!
I hope you all have comments for the reasons this may have happened. Every comment is welcomed!
PS1. The dead website has currently 58 backlinks, 50 from the internal pages, 1 from DMOZ, 1 from G directory, 1 from Alexa, 4 from another website of mine and 1 from another unknown site. Keep in mind that all the backlinks are the same for the last 15 months!
PS2. I read another topic about the value of DMOZ listing... Maybe the bell is ringing here!