Quote - Many upload large images simply because they can.  The fact that the maximum gallery size is 4096x4096 doesn't help either. There are some people who  push the limits and will always choose the far end of the spectrum rather than a middle ground.  That whole "bigger is always better" mentality.

Bigger is not always better. Sometimes I can see the pixelation in larger images because the source textures aren't that good...

Just like the images coming out of a digital camera were not meant to be looked at full size, I don't think most renders were meant to either.