I used to think it was a bad idea to buy the half point. However, i started doing it this year and i can honestly say it has made a world of difference. For example yesterday i had uconn -6.5 (bought the hook) and won on a last second TD.
If you go through all of the games each week plenty of games are decided in and around the "number." However, the only points i buy are in and around 3-4, 7 and 10. Otherwise i dont see the value.
However, i do not simply buy the half point every time the line is around 3,4,7 or 10. I usually use other factors to determine if i think that half point will matter. On a whole, i use it more in the pro's because the pros tend to land on the number at a higher percentage.
it would be nice if someone had some statistics to see if the NFL or NCAA had more games land on the number.