Instead of info. from a blog... How about straight from the horse's mouth?
Yes I do see the "many factors" part, however, that is very vague. What is less vague is the example that mentions the difference between 2 pages... no mention of sites, domains nor accounts. So assuming for an instant that the keywords are the same the only other specific reference they make is to the page.
I would also suggest that account wide smartpricing does not make any business sense at all. Everyone of us has pages that suck in regards to converting a click to a sale. It makes sense to smartprice that page. However, we probably all also have pages that do very well. Even if the pages that convert out number the pages that suck by 10 to 1, it doesn't make sense to not smartprice the pages that suck as those could account for thousands of clicks that could easily discourage advertisers. Also, I don't see Google leaving money on the table on clicks from pages that convert well even if the pages that suck out number the pages that rock.
Someone find me a piece of Google literature that mentions a click being penalized at the publisher account level.
Oh please... just because our publisher interface is limited that doesn't mean it reflects Google on a whole. Big G has some of the most intelligent and complex algorithms known to man when it comes to their SE, AW and AS. They probably take more variables into their algorithms than we will ever know and that only a very few could comprehend.