Rather than “expensive”, perhaps “quality of construction” would be a better choice of words. A good photographer can take stunning pictures with inexpensive equipment. For example, Arnold Genthe’s dramatic photographs of the San Francisco earthquake taken with a Kodak box camera. Nonetheless, as already mentioned several times above, why would any photographer deliberately use inferior equipment? On the other hand, I knew many successful photographers who only used a single camera for all their work...usually a Leica M or Nikon F series; and others who used a variety of dependable cameras.
As for myself, I use a variety of tools for drawing and painting, as well as enjoy using a variety of quality cameras (all possible because of abandonment of film by many , thus making the unaffordable now affordable). There is a certain tactile pleasure in shooting with a Rollei TLR, Hasselblad, Leica, Nikon, etc., which is lacking most inferior cameras, much like target shooting with a variety of guns. The aim of both camera and gun is to hit the target. However, for both camera and gun, having a quality instrument will not make up for skill and talent.
At present, shooting with Nikon S2. Has its quirks, and despite much better construction than Leica M (for example ball bearings), and more dependable than Leica, design is not as ergonomic or fast in use. I still fumble with Contax camera mount. Sometimes using a different camera can be refreshing...even a plastic camera.