EXPERIENCE THE FULLY CALIBRATED 70" ELITE DISPLAY AT OUR LOCATION !!
The Benefits of a correctly calibrated TV will likely look more pleasing to the eye, and will draw less power and even last longer. A correctly calibrated TV, in my experience, also ends up being a more pleasing image for most consumers. The image looks more natural. Blacks are blacker and whites are no longer bluish.
So to sum up, with calibration you're getting a trained professional to check over your TV's settings and setup, and a fine tuning of its color temperature to be more accurate. The cost of this varies, but a few hundred bucks is common.
The result is that the TV performs and looks the best it possibly can.
But, all TVs can benefit from calibration. Just because a TV is accurate with bright images, doesn't mean it's accurate with dark images. In most cases, they aren't. This can be fixed only with calibration.