We often hear that "It's the photographer, not the camera, that makes a good picture!" I will buy into that statement to a certain degree. Without a doubt, an expert photographer using a lesser camera will produce better imagery than an incompetent photographer using a top-line camera! That is usually the rationale given to back up the previous statement...
However, a good photographer shooting with a top-line camera will most often produce better pictures with that camera than he would using an inferior camera. This photographer will be able to shoot in a greater variety of venues, such as in low available light...
This was brought to mind recently as I was researching a bridge camera for my son-in-law and with a possibility that I might get one for my own use as a "bring everywhere" tool. I had forgotten just how frustrating it was using an Olympus C5050X to shoot my dog portraits...
The culprit was shutter lag which caused me to miss many great expressions and which often left me with images of puppy tails as the puppies exited the frame in the space of time between pressing the shutter buttion and acquiring the image. Even with pre-focusing it took what seemed to be an eternity for the camera to capture the shot...
How about shooting in relatively low light levels with a lens that has a smaller aperture? That is an exercise in frustration as is trying to achieve selective focus using a camera with a tiny sensor size combined with a ridiculously small aperture at maximum focal length...
As far as DSLR lenses go, the kit lenses can achieve pretty decent imagery when shoot in good light, especially if tripod mounted using f/8 or f/11. However, we often read posts from photographers with kit lenses asking about shooting amateur basketball and hockey games. These venues are often poorly lit and the lower level equipment is not up to the task...
Good equipment is there for a reason and it allows the photographer to stetch the envelope in getting shots that would be impossible with lesser equipment. Professional and high-level amateur photographers are just like everyone else. They would like to save money! If there were no difference between the capability of a Rebel with a kit lens that you can buy for say $700 U.S. Dollars and a Canon 1Dx with a tp-line lens which will set you back over ten times that amount; Canon could not sell the 1Dx and "L" lenses would be impossible to move off the store shelves.
Do we all need the absolute best in equipment - certainly not! In fact, some photographers would not do much better using a seven thousand dollar camera than they do with a cheap P&S. However, there is a niche in the photo world for every level of camera quality...
However, we cannot judge the capability of cameras and lenses by the images posted on the Internet. Entry level and inexpensive cameras are most often used by less experienced photographers while very expensive, top-line gear is most often used by professionals and advanced amateurs. The difference between the imagery shot by duffers with entry level cameras and experts shooting with top-line gear is, of course, night and day!