2. 2-3 days of every 6 month goes on installing so called but no change OS. Moreover you are not sure if your one year old pc becomes an old and blacklisted hardware.
3. You get more involved on upgrading/tweaking your favorite alternative of popular software and justify point 1
4. You are more involved on trying to turn the whole world to use Linux. Saying nice things about Linux (actually shouting), criticizing other stuffs (oh come on how foolish it is to say a software or OS which came 5 years ago which rocked the world, now seems to lack some features with the latest release of your alternative). Do you say your dad who taught you to walk is a crap, because now you can run and he walks as smoothly as before.
5. You are unhappy with the finely tuned and tested OS (which came with your hardware) and are eager to test the limit of your hardware (one day you will surely fail).
6. Linux users think every other people on this earth is a programmer like him. They would even write scripts to cook food and eat them if they could.
7. Scare people at first glimpse (My friend when saw neweley installed Linux said "Is this Linux?". Can't you just provide the nicest theme on the earth. If you can't do that all are same distro. Say it LinFedCrapBuntu. Some one actually said when will our computers be easy enough for us to use it as easily as a cake.
8. Quick and early adoption of technologies make the OS more unstable.
9. You don't even run the latest games and claim you can do anyting, and everybody should use Linux. Running some card games or old outdated games is some kind of gaming then go to hail.