Remember, Alexa only measures traffic to your site based on visitors to your site who have the Alexa tool bar installed.
1. How much surfers are having Alexa toolbar installed in their browser so far? Is that significant amount compare to all worldwide internet users?
2. In fact, I had some spyware problems while having that toolbar on my browser until I decided to remove it. Should I re-install it to bring me back my traffic rank? No matter what, having higher rank in Alexa still satify me :)
Alexa ranking is only based on the people who have the Alexa toolbar. So its like the TV ratings and based on mass calculation - should the surfing habits of those with the toolbar reflect the surfing habits of those who don't have it. Which is a grey area really.