No programmer support
The Open Saucy alternative to Microsoft Office is in trouble because it can't find enough programmers to develop it.
Can get back to conquering Gaul
The Italian Defence Ministry surprised the world last year by announcing that they were dumping Microsoft office in favour of an open-source alternative like LibreOffice.
Breathe new life into your old PC with GNU/Linux
Who doesn't know that new-gadget-itch? ...when you *need* to spend money on the latest and greatest whatever, because the thing you have on your desk or in your pocket is just too damn slow! Or the resolution isn't high enough. Or it doesn't run the latest and greatest software (Windows 10 anyone?). Maybe it's ugly. Or.... Admit it, you're just bored and want a new toy.
Nothing ever changes
Every three years I install Linux and see if it is ready for prime time yet, and every three years I am disappointed. What is so disappointing is not so much that the operating system is bad, it has never been, it is just that who ever designs it refuses to think of the user.