crobb305 - 6:10 pm on Apr 18, 2011 (gmt 0) [edited by: crobb305 at 6:12 pm (utc) on Apr 18, 2011]
Another reason COULD BE, at least in my case, that the keywords which those pages ranked for, were not English dictionary words ( nouns or else ) - they were product names
Well, funny you mention this. I have a funny story...A few weeks ago, I had a vivid dream about Panda (probably because it was so traumatic lol). But in my dream, I had a revealing thought: my hard-hit/Pandalized pages were linking out (via my affiliate links) too frequently using Trademark product names (along with Trademark symbols as required by the affiliate program). I'll point out that my site isn't "thin affiliate"...only 4 or 5 out of over 110 pages even had an affiliate link -- and only one or two links at that, with very descriptive service information).
The dream reminded me of my college days when on occasion I would dream about a math problem I was working on. Well, to make a long story longer, I woke up and looked at my hardest-hit pages, and sure enough, the affiliate links utilized the product name with a Trademark symbol. The unaffected page that I spoke about above didn't do this. I STILL believe the pandalized/unpandalized pages of my site boil down to my internal linking structure, but I did take my dream into consideration and changed the way I was linking to those services. So far, no changes, but then again no one has reported any improvement.
[edited by: crobb305 at 6:12 pm (utc) on Apr 18, 2011]