Some of Linux' popular selling points and how people will most likely respond to it:

1. Linux is cheap/free
: But I don't pay for my OS anyway, it comes with my pc/notebook/etc.
: But my employer pays for it

2. Linux uses open standard
: How does that matter to me?
: But my employer use a proprietary system which isn't compatible with 'Linux' ('s offering).

3. Linux has no virus
: But I get free antivirus from my pc/notebook
: But I still have another year of subscription to Norton

4. Linux is faster
: But does it run Crysis?

5. Linux is safer
: Windows isn't?

To me, there's no really strong selling point of Linux to the non-techies out there. Couple that with interoperability problem with enterprise systems and 3rd party accessories or 3rd party apps, then they get more problem trying to run Linux than not.