“Linux is based on Unix. BSD is a Linux distro and the core of OS X. So how do you say that Linux and Mac OS X have nothing in common?”
BSD and Linux are both Unix based but they aren't related beyond that.
" 99% of internet users do not know command line and do not care to learn it because they like GUI. So how can the majority of the internet disagree with me? "
I didn't say anything about internet users. I was talking about the platform the internet it built on: Linux. Without it the internet as we have it today wouldn't exist!
“The terminal/command line still exists because the closed society of Companies and Administrators do not want to let go of the profit the command line is giving them.”
The thing about Linux is that it isn't controlled by business interests, the command line is still in use because the people who know whats up with computers realize how powerful it is, sure, it isn't user-friendly but that isn't the final goal of all software: some things just need to work and having a GUI to manage them is just overkill. Also, there is nothing keeping you from having your own home server: only you make the command line a limiting factor.