You don't have to be wealthy to own a large flat panel or projection system. It is not uncommon for projection screens to be 120 inch diagonal or larger.
For UHD, it is recommended that the screen be at least 75 inches diagonal to realize the benefit of 4K.
I have an average size viewing room in an average size home and by no means wealthy. Currently using a 70 inch flat panel with separate speakers on both sides and 7.1 surround sound. Because of the speakers, I can only go up to about 80 inches screen size. Way back in 1978 was watching on a 6 foot screen. In the 80's and 90's was watching on a 10 foot screen in normal size homes.
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