PR, linking and PPC

noticed the relationship?

[Hard_Target]

I have two sites one of which is hevaily involved in PPC (100s of landing pages for different kwds, $1000s spent per month); and the other one's participation is a little lighter. Neither one of them have ever been optimized, submitted to anything, and one even has a dupe contents of another site (as I thought it would never be in SERPS, so that it wouldn't matter). I separated PPC sites from ones that I tried to SEO long time ago (on purpose, because I didn't know how to properly do the tracking, and I wanted to keep the sales differentiated).
I come to find out that they both have quite a few backlinks (the 2nd one less then the first one), PR 5 and 3 respectively, and most amazingly they are both listed in dmoz (and I don't even want to start with what I had to go through when I wanted to list my "real" site there).
Most backlinks are to landing pages that are not accessible any other way than via PPC.
Anybody has a similar experience to share?

[martinibuster]

>>>and most amazingly they are both listed in dmoz

The pages aren't seo'd and have informative content? How is it amazing that they got into dmoz?

If anything I think it shows how far you can grow your links when you stop thinking of seo.

[Hard_Target]

Both sites are purely commercial, no useful contents whatsoever, except what is needed to sell a single product. They have approximately 6 pages each - the most generic ones you can imagine (about us, features/benefits, order, privacy policy). Given the product I am selling, this is a valid "sales" design; other contents would simply get in the way.
My original "real" site, which I try to rank as best as I can in serps, in contrast has lots of useful stuff interesting to general audience ("history of widgets", free widget stuff"). It took 2 years of submissions and resubmissions to get it into dmoz. The two PPC sites are in there without me lifting a finger (and, mind you, one is the virtual copy of the sales pages of the original site, and it was still placed into dmoz - talk about manual review!)
It goes without saying that now, having realized what happened, I will get rid of duplicate contents as soon as possible