Why do you think that a lot of academic instutions, businesses and home PC users rely mainly on software you have to pay for rather than free open source?
Is it because they genuinely believe that it is superior software or just apathy and it's too much trouble to actually go to the effort of looking for the programs and having to manually compile the source code of open source software and they just want a computer to do everything for them without them having to put any work in? After all, isn't it us who are meant to be telling the computer to do, not the other way around? And surely a system that you have more control over, that you can configure yourself is more appealing?
Why not use open source?