TV Calibration is absolutely worth it. ISF Certified, and it increases your black levels. You get a cleaner, darker, more realistic image that saves you energy.
I agree, except with the saving you energy part. That really depends. It may or may not. If you choose an eco mode out of the box on some of the newer TVs, a calibrated TV may use more energy. On some displays, like projectors, calibration will have no effect at all on power consumption. The power-saving angle is a stretch, as even BBY says. The essence of calibration is about image accuracy, hence image quality. As a calibrator, one does not concern themselves with power use, and it doesn't necessarily correlate with power savings. Often, compared to out of the box vivid settings on a TV, it may happen to correlate with less power, but that is not a goal of a calibrated image.
But coming from a person that has worked at MHT for 3 years and before that an independent HT store for 6 years, I think it's fair to say I know more than armchair "Home Theater experts" on AVSForum and the internet as a whole.
I hope you realize that this is a fairly insulting, and ignorant assertion. I hope you realize that many of the engineers behind the displays you sell, or displays a good deal more advanced than you carry, are members and participate in this forum. I hope you realize that many of the studio engineers, video compressionists, mastering engineers, mixers, codec developers, and many more who are behind all the technologies in your products and the content you sell, participate in this forum as well. So if you're going to come on here trying to claim that there is a visible performance difference among functioning HDMI cabling on a forum where there are people intimately involved with the design and engineering of HDMI cables and HDMI technology claiming that you know more than the entire internet, you're going to get laughed right the heck out of here for such absurdities.
On this forum are engineers, founders, etc, from the likes of Dolby, Denon, Marantz, JVC, Triad, Audyssey, Microsoft, Accupel, etc etc etc. The list of professionals around AVS is quite long. The amount of knowledge you can dig up, if you dig, is VAST. I suggest you drop the attitude, FAST, because you'll not learn anything if you think you know more than the very people who designed and built your products and technologies from the ground up.
If an HDMI cable is functioning for the bandwidth you are requiring of it without dropping pixels, then you are getting 100% of everything and it is not distinguishable in any way from another functioning HDMI cable. This is not to say that HDMI cabling is not a serious concern at high bandwidths or at distance, but when an HDMI cable fails, it fails rather spectacularly. There are no shades of differentiation as there are with analog cabling. It either works, or it does not work.