It is believed that alexa counts your unique visitors when your site gets accessed via alexa’s redirected. Obviously, webmasters start abusing it.
Although alexa never confirmed or infirmed that the redirect helps alexa rankings, it’s commonly known that it does.
One week ago however, all alexa’s redirects started to give 404 error. Check example:
http://redirect.alexa.com/redirect?www.gamingtype.com
Seems like alexa didn’t like the fact that their algorithm was so obvious so they decided to remove the redirect 
Pathetic
There is some controversy over how representative Alexa’s user base is of typical Internet behavior. If http://www.alexa.com/data/details/main?url=www.fortunehotels.in Alexa’s user base is a fair statistical sample of the internet user population, Alexa’s ranking should be quite accurate.