Asking what a top Google rank is worth in cash money is like asking why the sun shines. It's a simple
question, but a good answer is horribly complicated. This is an area SEO and ad people have been
fighting over for the past 10+ years, and every expert in the business will give you a different answer,
even allowing for basing on the same narrow area of business
This was the best report i could find, and it's not terribly helpful.
Typical to see figures for a CPC (cost per clickthrough) between 10 cents and $2, but that can
vary wildly by subject, geographical area of the customer, day, time of day, and an endless
list of other factors. As Greg intimated, the word "mesothelioma" has been a "hot" search
item for years, thanks to sleazy lawyers chasing the asbestos industry. You also see "hot" results for
certain prescription drugs, porn, and several other things that generate massive profits. Most of all,
the word "insurance", because ordinary folks are constantly looking for cheaper auto, homeowners,
or health insurance online.
This guy's charts gives some idea how extreme the variations are.
None of this applies very well to Wikipedia's "value". If it were a for-profit corporation, it would have a
market cap in the billions, easily. But its "value" is based very heavily on absurd intangibles derived
from its magical power as a "free", "open source" thing, that just happens to be heavily linked by
Google searches. If it had gone for-profit, as many have noted, it would not have succeeded to the level
it has reached today. "Goodwill" counts, unfortunately in this case it's a very difficult thing to place a
dollar value on.
Don't forget
this 2008 TechDirt essay.
"And that, in turn, could gradually antagonize rank-and-file Wikipedians, who might resent having their labors
generating millions of dollars to be spent by a self-perpetuating elite that may or may not represent their own
interests and values." Note that was written before Sue Gardner showed up and turned the WMF into a very
effective fundraising scam. They now have such an "elite": Sue, Erik Moeller, and a few other staffers at the
WMF. None of whom were elected by anyone, all of whom were more-or-less handpicked by Wales The Questionable.
Do you realize that if someone ever shot Jimbo in the head, Wikipedia's "value" would plummet?