The cached page often renders so poorly that that function will only be used when you really need something and the page is down (or deleted). If the content experience weren't so hit-and-miss, who wouldn't use the "view cached" option to enjoy the speed of Google's cache?

There is no hit-and-miss experience with the "View image" feature -- you get access to exactly what you came looking for, and in a more convenient and speedy way.