There are more than one set of disciplines in science, in political analysis, and in business that routinely use data collected from people to glean useful information upon which to determine courses of action and answers to key questions. The statistical analyses used are designed to isolate consistent trends from massive amounts of data containing many variables.
These analyses start with the understanding that useful information is embedded within raw data containing significant amounts of "noise", or useless information. The analyses isolate the useful information, and often multiple analyses are applied to the same raw data set. When the analyses identify a consistent trend (useful information), they automatically assign a degree of confidence to the trend. When examining the results of the analyses, both the answers and the degrees of confidence associated with the answers are considered together. This is done in radio astronomy (how do they really know there's a new planet out there a thousand light years away instead of just cosmic static?), it is done in DNA analyses such as the subject of this thread (the isolation of useful information from massive amounts of relatively poorly understood genetic code), it is done in politics when leaders are trying to select the best course of action to achieve a future goal, and it is done in sales and marketing to identify what products to develop, how to sell them, and where to sell them, among other things.
So to say that anecdotal information has no scientific, political, or economic value is a fallacy. It is used all the time for valuable reasons. Even paleoanthropology is subject to anecdotal information, because that is exactly what the contextual interpretation of the circumstances surrounding each find amounts to.
If anecdotal information were never used in science, there would only be hard science. It would all be 2 + 2 = 4. There could never be multiple hypotheses (essentially multiple interpretations, of which only one can be true) applied to any raw data set in any science. And a scientific "fact", once determined, would never be replaced by a subsequent "fact". All scientists would be right all the time if anecdotal information were not part of science.
Because science itself uses anecdotal information, science has determined how to manage it to maximize its value. Science does not, however, casually dismiss anecdotal information with the wave of a hand and a smirk.
This isn't the first, or even the fifth, debate over anecdotal information on this forum, just the most recent, and I've got to say the least inspiring, after discussing exactly this issue with skeptical icons over the years like Saskeptic, whom I consider to be both a professional and a gentleman. These debates are cyclic, and at this point are nothing more than obfuscating noise as defined above.
Understanding this will not tone down the less mature skeptics, however. One has to conclude, after watching the repeated cycles of new skeptics, that there will always be some who are not interested in informed debate, but in simply heckling the forum.