With credit (or blame, if you prefer) to MAL for the inspiration, as well as the number one reason.

10. Just not feeling the Thunderbird nor GIMP love
9. Willing (eager, actually) to “pollute” the OS with proprietary drivers to (try to) get everything working properly
8. I have a boyfriend, and even something of a social life
7. No plans to worship at the altars of Torvalds, Raymond, and/or Stallman
6. Troubleshooting a borked install is not a fun way to spend a weekend
5. Don’t see a Linux distro passing the Granny Test anytime soon
4. Not enough of a codehead to recognize (and run away from!) all variants of “rm -rf *”, “mkfs.ext3”, and the like
3. Not yet queen of the command line
2. I actually like to spend time away from my computer
1. Since both parents are dead, there’s no basement for me to move in to, to correct these egregious shortcomings