1. It's free.
2. It isn't Windows
3. You can run whatever you want to
4. It'stable
5. It's secure
6. Support is free and plentiful.
7. if you don't like something, code, or download something new.
8. You don't need to pirate anyting
9. You don't need to hide from the feds.
10. You are the coolist kid on the block
11. My old 486 still runs fine as a firewall, and a PI as file server
12. You can run multiple OS's on the same PC to save costs on power consumption
13. It's fun to hack the kernel, in order to speed up the PC or try out new networking features.
14. Games are generally free

15. You don't need to worry about viruses, worms or trojan horses.
16. Your PC could be controller remotely much easier than Windows
17. Running your own web, mail, database or development server is already part of the normal installation.
18. You can choose between many different desktops to use
19. If you don't like Open Office, then use something else

20. IR doesn't invade your privacy anymore.
21. You can joi a lot of geek get-together's, for free.
22. You don't have to pay R1200 per hour for telephonic support.
23. You don't need to upgrade your PC every year just cause your hardware vendor says so.
24. You can learn to code, without any extra costly tools
25. You can learn to hack, and other hackers won't think funny of you

26. You have a choice of at least 20+ distro's to use. If the one doesn't suit you, try another. And it's free

27. You can legally copy your OS CD and give it to your friends.
28. When last did you reboot? Yesterday? Last week? I rebooted 287 days ago

29. don't like thunderbird? No sweat, try out something new. now extra cost.
30. You don't need to fund someone else's mistakes.