(attn) Well, you could guess that - but you would be wrong. Here is why.
Large format displays are primarily designed to be viewed from a greater distance than a typical display. Bearing this in mind you have to realize that an insanely high resolution would result in a very tight image, yet also would result in detail that was functionally useless in practice. Negating the possibly negative effects on the human eye, it simply wouldn't make sense to have a monitor that large with a high resolution; you would now have to move your neck to see other areas of the display. You would also be viewing the display from multiple angles seeing as your head would likely be somewhere near the bottom center of the monitor.
We run our 50" Plasma at a resolution of 1024x768. Yes, it can go higher - but it's not what the device is used for. I'm sitting literally about 10 feet away from the Plasma screen and I can read all the text on it without a problem.