I mean, pizza is good, but how good it will be after 1 year of eating exclusively pizza?
2. Knowing many and relatively different things means more information and more information means sometimes time and/or money. It's like acting. Acting in a comedy it's a good thing, but a good actor can act also in dramas. Like driving: driving your car it's necessary but learning how to drive a bus, doesn't hurt you.
3. Every tool has it's own purpose. Continuing our car analogy, you need a fast car if you want to go somewhere and you are into off road, you'll need a jeep.
4. Linux means jobs, too. Often, better payed than their windows equivalents: real jobs, real money Niche domains would produce better incomes. I know this, I'm a C++ and .NET programmer but old ugly Cobol jerks are earning better.
5. Many of the Fortune 500 companies are using Linux. Actually, Microsoft is runinng Linux. For Redmond, there are 400 Linux servers in the Linux Labs, all the Aruba Routers run the Linux kernel, Hotmail.com runs on 15,000 FreeBSD servers, and Microsoft.com and MSN.com all run behind 15,000 leased Akamai Linux servers.
6. It's stable. Stable means rock solid stable. You can run it for years and years. No operating system crash.
7. Many of the things you do on windows, you can do on Linux. Watch movies, listen music, surf the net, talk to friends on aol, msn and yahoo, play some commercial games, 3d drawing, 2d drawing close to Photoshop quality and many more.
8. Michael Dell is running it. see for yourself.
9. It's free. I mean it costs you no money. If you don't use some very rare apps, you can use your linux computer for the same tasks as windows and you don't have to pay Microsoft and others any fee.
10. It's cool. By cool, I mean really, really cool.
and
I'm happy if'll know I have convinced someone to try linux. It's actually worthing.