Yeah, some people believe that Alexa is an accurate indicator of traffic. But it is very easily manipulated. If you are not in the top 100,000 websites, just adding the alexa toolbar onto every browser in your office and visiting the site with those computers every day for a month or two will result in huge Alexa gains. Quantcast is much more accurate.
Alexa is not important. It doesn't provide any really accurate data, it is very easy to manipulate, and the only advertisers who are going to use it generally are not going to be spending much on your site.
SEO Moz rank is not the same as Alexa, and in my opinion is more accurate than page rank when it comes to judging the prospective value of a website.
My advice, focus on your analytics, not meaningless metrics.
The best way to improve an Alexa ranking is to install the toolbar and just visit your own site a few times a day (and even better if you can get a friend to do the same) and then watch the big improvement in the site’s Alexa ranking. Make sure you do not visit your competitors site, as just visiting them will improve their ranking! This makes a mockery of the Alexa rankings.
Alexa rank is only important if you're selling your site to a moron that think it's important.
The rank is created from people dumb enough to use the Alexa toolbar. A tech site with 100,000 visitors daily could have an abysmal Alexa rank because their visitors aren't stupid enough to have the toolbar installed. It doesn't mean anything, and as said before, it can be easily manipulated.
In terms of SEO and quality, alexa rank doesn't have any importance. It's just an indication of the amount of traffic a site is receiving and a point to note is that it is not perfect in that aspect too.
There are only two metrics to measure the performance of the site, one is alexa & another is Page rank by Google. Alexa will give the rank to the site based on the number of times the user visited the site. Alexa will resembles how your visitors behaves with your site. It's will to identify the how popular your site is
i remember markus in his legendary WebmasterWorld thread ("how i made a million in 3 months") mentioning, that he actually blocked alexa and comscore for competitive reasons. namely to prevent business spam and lulling competition by staying under the radar. he stated, that out of 600k visitors, only 60 had installed the alexa toolbar. and that was 2006, so probably the number is rather worse by now.
i think that's outstanding business sense and exactly the way to go about these metric sites. rather keep control of who gets to know the true value of your website. as mentioned, only an absolute moron would buy a website because of alexa stats anyway. in my experience, there are a hundredfold more potential copycats who are out for destroying your business than serious beneficial business contacts to attract.
I think even in the days when Alexa was thought of as important, the data was very inaccurate and easily manipulated. The Alexa bar was generaly only installed by people within our industry. It was a figure based on the demographic of the user and often altered radicaly by the site owner.
IMO it has no value, and never had any meaningful value.