Normally, individuals generally favor betting on their preferred group so the underdog is more likely to be underestimated. The odds do not show the genuine chance that it can cover. Moreover, the bookies know that you are more prepared to bet on the favorite team so they can consider benefit and create an inflated line. In this case, betting on the underdog will give you more chance to win.
What is Pligg?

Pligg is an open source content management system that lets you easily create your own user-powered website.