It's not just here at the Rx but everywhere, for the reasons given in this thread, why most bets are on the over and not the under. Most of the bets made on a game are from guys who want to watch the game on TV. Betting the under, they could lose their bet anytime during the game and there goes the fun of watching the game to follow their bet. An Over bet isn't lost before the end of the game.
The books know most players play the over and they adjust the over/under line to try and get more Under bets. This is very important because it means Under players have a better chance of winning whenever the line is adjusted by the books trying to get more Under money. The book is your friend when you are playing the total they need.