Is almost a need to do with todays TVs.
calibration was first done on old black and white TVs, it was a free service from the company you bought the TV from.
But today you have everyone making HDTV, Im suprised best chioce and always save doesnt make TVs now.
anyways the TV's today are setup to look good in the store under high lighting and next to other TV's so to stand out there have to push brightness, colors, and sharpness to a new level.
And to do this they loss the accuracy of sharpness and color, by overpushing everything and changing colors and color tempatures, that give the TV a blue picture to give you a apperance of brighter whites and brighter color, the same way your tooth paste and laundry detergent are Blue in color to make things look brighter.
its the same as if youve picked out paint in the store and then went home and painted the wall, it always looks diffrent in the home vs the store do to the lighting in the store because it has a diffrent color temp.
by adjusting color, brightness, sharpness, and color temp you can get a pure image that is more true to life.
but the problem is almost all TVs dont give you full controll of these setting to fix the problems, this is why you need a proffesional to do it in the service menu of the TV.
You can change some setting, but then you must know what setting to change and where to change them to, and the service menu is like reading a diffrent language it has setting called VSM, Gamma, White balance, RGB push and Cut-off and it takes a trained person to do this because you can change the wrong setting and mess up the TV its self.
You dont need to get a calibration from BB, but its a good idea to get one if you want a perfect picture.
hope this helps