The reason the 4K TVs are so large has nothing to do with greed. 4K is still very expensive to produce. If a 46'' 4k TV costs $8000 to build, and a 55'' costs $9000 to build then you build the 55'' TV. The reason you would do this is because anyone in the market for a $8000 tv is not looking for savings, they are looking for top of the line and do not care about cost. They also likely have a larger room to put that TV in, and a 46'' TV would not be as good of a fit as a 55'' TV. Thus, any 4k TV they make that is not targeted to those who have large amounts of cash to burn on opulence will not get sold. For now, 4k TVs will be very expensive until the cost of production is lowered.