> Google has been trying to substitute ads for content and trying to get people to go along with it. Of course Google can show you a multitude of sites about supplements and maybe 2-3 ads, not 30 ads and a few results (buried by ads.) Just because an ad is "relevant" doesn't mean it's anywhere near the same, financially speaking, for the user.
Having money and having valuable information are not 100% correlated. Therefore, showing only information published by the people with the will and the means to promote it will always have some problems.
You want evidence that the most advertised product is not necessarily the "best" one? OK, but right after I prove that the sun rises, more or less, from the East.
Placing adds at the top of the search results. It's basically saying hey just FYI you may be interested in this add vs the adverts to the right which are clearly adds and generally less related to your search.
Ah. Well, I can scroll down. But it does reminds me of complaints about the shades of yellow used. It is #FFF8E7 BTW. On some laptop computers, it does look more whitish the more you tilt the screen to the front. As for why, read Douglas Bowman's infamous post about why he quit Google for clues.
Evidence?