Actually there are TVs that have a native 24Hz playback mode. And when you turn this mode on you'll realize why its a very very bad idea. A frame rate that is this low HAS to be converted to a higher refresh rate otherwise it would be unwatchable. Again this is exactly what happens with film projection. Nothing is ever shown at native 24Hz.
Ok, I need further clarification on this...
It doesn't make any sense for TVs to allow the user to bring the display down to 24Hz, just to see that the native is horrible to watch. Actually, you are saying it is UNwatchable for anyone right? Because some dudes do claim that "they prefer that way", and that they "don`t notice one thing", and that is "even better than any other rate". Yes, I am coming across these type of folks on the net, and they're pretty irritating. You do mean that 24Hz native is UNwatchable for any human being, right ? These guys are out of their minds.
I tried to bring down my PC panel to see what was with 24 Hz, and I can tell you it is even hard to look - fonts go shaky and flickering reigns. So I guess that would be the same effect on a HDTV LCD panel.
But then again...
If something HAS to be converted to a higher refresh rate, why HDTVs allow the user to bring it down to "see the effect". Wouldn`t that kind of thing being even considered as a risky operation in any user manual ?
And you end saying that nothing is ever shown at native 24Hz, well, if the user don`t turn that on, correct?