That's because most of those broadcasts that 'come in at 1080i or 720p' were not material recorded originally in a format conducive to a good conversion to HD. Some were recorded digitally at lower resolutions, and then upconverted. Others were converted from old film. Still others are recorded digitally and in Hi-Def, but by people who are still learning the new equipment/techniques, not by the experts who are making the movies. The more time and money someone puts into production, the better it should look, so of course Blu-Ray is going to look better than 30Rock or your evening news. Hell, ESPN sports in HD looks pretty damn good when you consider that it's live. You're kind of proving our point, and that is that 1080p is not worth it unless you have HD-DVD, Blu-Ray, or some other true high quality 1080p source.
And then it's debatable. A true test of whether you can see the difference is to take a good 720p set and a 1080p set of the same size, and watch the same material on them. Run that same Blu-Ray through both of them. Yeah, the 720p unit will have some some downconverting going on, but the issue is how much of a difference can you see. I bet the difference isn't near as big as you think, unless you're using a huge set (50" or bigger) and sitting really close.
Then go ahead and do the same thing with your Sportscenter in 720p. Your example above makes the mistake of comparing the content, and then drawing conclusions about the TV based on them. If you want to decide about the TV, you have to keep the content constant, and compare that way.
If you recall, the original poster is looking for a good TV to watch sports on. So you've informed us that expensive TVs are slightly better at watching 1080p movies than cheap ones, IF you have a HD-DVD or Blu-Ray player. That's great, but not relevant to him wanting a TV to watch sports on.
Are you trying to pretend I didn't do the math for you, plain and simple? Your 6x figure was way off. Period. Anyone who can use Google to verify what these resolutions are and knows how to multiply and divide can tell that.
Fair enough. I've never looked at what TVs are 'rated at' so I'll take your word for it. I usually don't trust the manufacturer of a product to tell me how reliable it is. The general info I've heard and read is quite a bit less than that, but who knows? Lots of products get a bad rap early on and then get better with successive versions, so maybe the new ones last longer than old ones.
I am still skeptical of 60k hours, though, no matter how much they may have gotten. Even if the LCD panel lasts that long, you'll probably have to replace a lamp/backlight well before then, or have some smaller circuit in the TV fail. When someone's looking at a several hundred dollar, out of warranty repair 6 years from now, knowing they can buy a new set that's better for just a little bit more, do you think they're going to repair it? That LCD panel may as well have already died, because that customer is going to pitch that thing for a new one without a moment's hesitation. I worked retail just long enough to learn that almost all people will do this.