A lot of people who use Linux like to use open source just because it's open source, and not particularly because it's better (anyone who says LibreOffice is just as good as MS Office is crazy). That's why you see a lot more firefox and chromium than you do on Windows or Mac.
I disagree. There is another possibility: LibreOffice is good enough. I (used) to have relatively simplistic needs for spreadsheet and word processing tools, and in that sense, LibreOffice and MS Office were virtually indistinguishable.
