We all buy what we want for one reason or another. AS you said....the companies make the software...so people must be buying it.
I have flight simulator software that I enjoy using....not because it will help me with "what it's really like" to fly. I just enjoy using the software on days when it's nasty outside and not flying weather. I hate watching TV all the time....I can only spend so much time building my airplanes....so what "other" better way to spend time that flying using the simulator software. I would suspect others would agree....maybe not on the same points that I have mentioned....but just the same...they use simulator software of some kind as well.
It's your money...your time...your choice! If that is what you want....buy it and enjoy it!