Because the level of knowledge in so poor. Last year when I was the absolute sound of a big show in my country. I went on Monday ( dealer day) with my own music to listen to many sets.
Even the expensive sets with B&W D800, Focal Scala, Dynaudio Platinum and many more were not that special. I was listening to mistakes all the time. I was surprised how low the knowledge is.
People don't know anything about how big instruments and voices need to be in proportion in real. Many people even in this business know little about 3 dimensional sound. Many dealers came to me how I create such a 3 dimensional stage. Many never heard it so clear. This is how I sell audio for many years. For me it is a normal thing.
In shops it is the same. Don't forget I am addicted to music since I was 6. This is not my work, or even hobby. This is a second nature. For most it is work. I have done thousends of test because I love it and it does not cost energy. The approach is totally different. I don't f..care how much money I earn. I am only interested in giving people the best quality in sound.
In my country audio is having a rough time. What you see is that they focus on selling those brands where they earn the most money with. These are never the best products available. How stuppid you can be!
There is not a lot knowledge about roomcorrection. I do it for 3,5 years now. I have done many tests to understand what it is. And I use it my way. Because I wanted to get the best sound possible. That is not how the people who made it use it. Because that level is not good enough!