Reasons to use Linux.
1. It's free - So is Windows it's came with the PC I bought.
2. It's easy to use - Can you just turn the PC on and it's there? No you have to backup your data, install it, create a login then put your data back on your PC, once that's done you can use it.
3. You can use some of the applications you are used to - "Some" why not all? Well there are alternatives but you can learn the differences as you go along.
4. It's good for gaming. - "Excellent, I've just bought this latest game, will it work?" Not yet but maybe, you'll have to wait and some older games may need a bit of persuasion to work.
So I have to take my perfectly good PC, spend time backing up the data, install Linux, put my data back, install applications that may or may not do what the standard Windows apps do and if i'm lucky they'll be compiled binaries. I will have to hope that the game I want to buy works and I need to learn the differences as I go along?
This is the typical thought process of everyone I used to to tell about Linux, i used Linux, for me it was fine but for someone who want's to buy a PC, work on a PC and play on a PC Windows is the easy, free and most compatible option.
Until there is 'A' Linux, the one true distro, then there's little to no hope of Linux ever being adopted as a serious desktop OS. other distros can, and should, exist but The Linux Foundation needs to set some rules such as a standard desktop environment, standard package manager and a set of standard applications. Everything else will be an unofficial testing ground for potential alternatives.