Exactly! It's all marketing, 192KHz and higher rates are the same as high megapixel count in digital cameras, people need to see the reason to pay more.
I agree that MIDAS Pro line are far more capable desks than X32/M32, but..... how many users do really need it and willing to pay premium price? Some do, but for most at our price segment, mean clubs, churches (not the big ones), weekend bands X32/M32 will do the job just fine. It's like buying Bentley or Mazerati to do grocery shopping. Besides, bad PA will mess up your sound more than bad desk.
Most requested on rigers console, the Profile, is 48KHz desk. As are Yamahas, M7 and CL5.