I'd have to take your word for that and/or google it. It doesn't make much sense to me - I can't quite see how a faster refresh on an LCD screen would improve actual picture quality, given the same LCD panel - especially on regular TV and internet sources.
Maybe this is where your opinion of 120Hz comes from. 60Hz TVs are not just entry level. Many manufacturers have 60Hz and 120Hz models based on exactly the same LCD panels, with the same response time, colour gamut, sharpness, etc.
By the time the "long run" comes around, that salesman is usually not selling any more, smart or not - or not selling TVs at least.
Some info: http://www.pcmag.com...,2379206,00.asp
Not a bad article at all. In response to your first 2 comments, the improved refresh rate makes the improvements from the rest of the tv possible. In the article you linked, it talks about how smooth-motion and other similar features take the frames that you feed the tv, and not only cleans them, but uses them as a base to make in-between frames that improve the frame rate. As the article states, most of the time you should turn this off. Unless you have a TV that is actually good at it.
When a lower end tv or one with a lesser "engine" does this, it can create picture distortion and artifacts, very commonly a weird, cloudy effect around the focal image in the foreground as it moves. A higher quality tv, like a Sony or Samsung, is going to do this so well that you do not get these unwanted side effects. When this feature is running, it will improve any image, to the point where the framerate is so smooth that you feel less like you are watching TV and more like looking through a window (obviously the lower quality the image, the less you will get this... nothing is going to make old vhs tapes look like a blu-ray). The main drawback to this is that it can be disorienting, even cause motion sickness in those that are prone to it, but generally this will stop after your eyes adjust, anywhere from an hour to a day, after which you can deal with the effect permanently.
As for your last comment, this is kind of getting to the point where we are going to get into alot of if's and when's, but philosophically, a salesperson who looks out for his/her customer's best interests is always going to be more successful over time, and will generate more return business, as well as word of mouth from family, friends, and coworkers. And even when they stop selling, they will have passed on a culture of honesty and integrity to anyone they work with or train.