Are they still relevant in 2015?
I thought we had SJWs to make the internet annoying now.
How so?
Poor people usually use a 2005 HP Pavillion with Windows XP.
And they usually don't overlap with #4, below.
...and,
4) Engineers, mathematicians, students, people in technical professions.
I believe those are make up the largest Linux user base.
Then again, lots and lots of them use Macs, some are Windows aficionados, but Linux systems are huge there.
And for a reason: industry standard tools come in a central repository, preconfigured with all of their extensions - all TeXLive packages, nearly every Python or Octave module is there, et cetera.
To use any system, after all
Not really, you actually have to work to use a Linux system you can't just install office and go.
Of those technical folks how many are using Linux on their home box vs how many are using it on a work cluster?