A few reasons why, i like i mean love linux.

 
1. You do not need a product key to install or reinstall linux.

2. You are not limited to installing linux on just one machine.

3. There is no license fee now or for the foreseeable future. AKA proprietary software tax.

4, You do not have to have a special version of linux for every task or roll you do.
(i.e. thin/fat client, various server types, router/switch, terminal server, or etc).

5. You can modify your linux by adding  and removing packages for the tasks as needed.

6. You can start with a minimal install and then add software as needed and hardware as needed (i.e. a monitor or additional ram..)

7. You can easily access a linux system remotely

8. To me the command line utilities are so powerful. Combining them together makes them even more powerful. You really do not need a gui/mouse to use linux.

9. You can install linux from a local web server or the distro home site with just a floppy,  You do not have to have an ftp/pxeboot server. *you can setup linux as an ftp/pxeboot server if you need too. Do not have to spend forever in downloading a cd/dvd plus time in burning the media.

10. Love that I can reuse older equipment for various tasks. i.e using Slackware
14.x on a Pentium I (i..e.router or a light web server).

11. Linux is offered on various platforms (i.e x86 x86_64, arm, ppc, atom,and etc.), so you do not have to identical equipment for all the systems.

12. You do not have to worry about software being yanked from your system for arbitrary reasons.

0DH. There is a myriad of software available and you are not locked into using just one software "store"to access that software.

14. In general, you have complete control over your systems and the software does not phone home with data from your computer excepting some servers for management purposes, but it can be easily removed.

15. You can interface different hardware and or electronics to the various ports. The hardware does not have to be name branded.

16.You get or can get the source code which leads to the four software freedoms:

The freedom to run the program as you wish, for any purpose (freedom 0).

The freedom to study how the program works, and change it so it does your computing as you wish (freedom 1). Access to the source code is a precondition for this.

The freedom to redistribute copies so you can help your neighbor (freedom 2).

The freedom to distribute copies of your modified versions to others (freedom 3). By doing this you can give the whole community a chance to benefit from your changes. Access to the source code is a precondition for this.


18. Speaking of software, you can compile or translate basically the same high level source code (with exceptions)  for different platforms.

19. Less likely to get a traditional virus, but you do have to watch out for rootkits.  Speaking of that, updates are usually pretty quick compared to other systems.


20. There are lots of very good games if people took the time to check them out would be surprised.

21.  Documentation is out of this world that is available.  Rarely have I left a web search unsatisfied.

22. Linux is continuing to improved itself on a timely basis, that is not so true of competitors.

23. IF you understand how computers work, to me it is very easy to learn and adapt to linux,

24. You are not stuck with a single gui offering for the desktop, so you can pretty much create your own environment; (as I said before you can even choose not to have a gui).

25. Do not have to use the internet to use my computer. It is easy to set up an intranet for local usage. You are not locked into the cloud. That can be a boon for security in come cases.

26. Return on investment can not be beat compared to commercial operating systems.

27. Can control many computers at the same time without even using a mouse.

28. Does not require as much disk space as certain operating systems.

And there are many many more reasons.