ColourOfSpring - 8:47 pm on May 26, 2013 (gmt 0)
That's a very good and precise question to look at, diberry. From an initial check, I'd say #X is not the same number from query to query, but something like this pattern seems to exist for the more competitive transactional keywords - and not for informational queries.
I would have thought that diberry was talking exclusively about commercial keywords. I know on this forum, I'm only ever talking about commercial keywords. If I'm searching for something non-commercial on Google, I get the "old Google" - bigger variety of sources, much less host crowding. Commercial searches? A narrow range of brands, heavy host crowding, complete lack of variety (for the large majority of commercial searches).