Unfortunately photography is one profession that anyone can just buy a camera and become a photographer. Does it mean they are good at it..no.....You can't buy a stethoscope or scalpel and just become a doctor, or buy new golf clubs and become tiger woods immediately or buy a fast car and become a Nascar driver....these things take time to learn and actually perfect the skills needed to perform.
A camera is a camera, most people that start new photography businesses don't even know how to use their own camera. Lots shoot and let the camera make all the decisions.
There is a difference between just taking photos of people or things that happen to be in front of you and trying to genuinely create something amazing through direction, use of light, angles etc. Photography is all about the light, for landscapes it's being there at sunrise or sunset. For people it's posing skills, making them feel comfortable and being able to see the good light and using it to your advantage to make them look their best, plus picking the right lens to compliment your subject whatever or whomever it may be. For weddings it's the same except you usually have a time restriction during your days.
If you can't see the light or create it, know how to compose, know how and take the time to learn and actually be able to use the camera to it's fullest, or know how to interact with and direct your clients and know how to use light on your subjects creatively to make a killer photo then a new 7000 dollar camera isn't going to really help you.
BTW, I think your quote should be:
"You can't buy a stethoscope, scalpel or golf clubs and just become a doctor..."