I have a website for more than one year (it's a blog with .com domain).
I track my visitors using Google Analytics and I mention that I have an average of 7000 unique visitors/day. The whole year since my blog is online I had over 2.000.000 unique visitors but my Alexa.com Rank is 25.000.000
How is it possible?
Note that some of my visitors came from PTC websites or traffic exchanges.