I've always found the amount of weight webmasters give to Alexa pretty interesting. It is, in my opinion, an incredibly over-rated metric.
Consider this from their own site's FAQ on how they measure traffic for its rankings:
Quote:
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Originally Posted by Alexa
A site's ranking is based on a combined measure of reach and pageviews. Reach is determined by the number of unique Alexa users who visit a site on a given day. Pageviews are the total number of Alexa user URL requests for a site.
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Alexa Users... those who have the toolbar installed or search for sites on the Alexa system.
The only people I know who have even heard of Alexa, let alone download and install their toolbar, are webmasters. I'd hardly consider webmaster traffic a good indication of reliable, quality traffic.
I don't give any weight, whatsoever to Alexa. As a general guestimate metric, sure. Beyond that, I think it's rather worthless and entirely over-rated.
Of course, that's just my opinion and it's not meant to try and convince anyone else of Alexa's accuracy, or lack thereof.