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This would explain a lot. People tend to link to the most authoratative sites on a topic. Rarely is a single page site going to be very authoratative. And, if the topic is so narrow a single page site could do it (say, one that told the history of a TV show cancelled after 6 episodes), then surely the topic is so non-competitive doing well in the SERPs should be trivial.
Beware that I´m not sure how Google treats a resource that returns 200 OK but has a content-length of 0.
Andreas
I think a 200 with a 0 content count gets gray barred though is in the db as a url. Not 100% sure. G Mods may know better.
Certainly as minimum's go, there is no such thing, but its all dependant on content, one page per keyterm target, is optimum, though takes a hell of a long time to get good enough to get to a postition of targetting less than 15-20 keyterms, never mind one. Involves very precise planning in the design of the site, and the upmost adherance to not crossing theme's or create SE readable multi-branch terminolgy.
In a perfect world, obviously its possible, in the real world, extremely hard though if you work with your logs, then you can just constantly increase the scope of the site to accomadate all KW's while maximising SERP positioning on each and every one.