This is what I'll be posting on the wiki:

Now that we're all familiar with Photoshop, we should be able to list some clear advantages of using Photoshop (why not just use paper and other utensils?). In the situation that someone asks you what's so good about Photoshop, or why even bother using it, these advantages would come in handy. I know that many of us had to do an essay on "Uses of Photoshop in School", and those uses could be posted up here aswell.
*Not having to deal with copyright issues: You are rightfully the owner and author of any work that you create on Photoshop. This means that you control whether other people can distribute your work, change it, make money off of it, etc, etc.
*Being able to mass-produce your work: Files created on Photoshop are digitally stored. This means that you can print as many copies of them that you want, or have as many copies of the file. Artists who paint only end up making one copy of their work.
*Work is harder to lose and easier to access: Since Photoshop work is stored digitally, it is harder to lose that worksimply because you can store/place the work in a large number of places and copy it over and over again.
*Time is saved: It is much more time efficient to press the Paint Bucket and have something painted. It would take a lot more time to get a bucket of paint, paint, and then clean up the big mess that you just made.
*You don't have to be an artist to be good at Photoshop: If you're not good at art, Photoshop could be a different story. Look at the work like math: it is just a series of numbers and by changing those numbers you change the work (not as much skill or expereince required).
*If you go into marketing, Photoshop is an excellent skill to have: With Photoshop, you multiply what you can make and how you can make it exponentially. If you master Photoshop and start making original art, people will notice you a lot more and you have a greater chance of your marketting campaign being a success.
*You can undo any mistake that you make: Simply by pressing a button, you can go back and edit/undo any things that you don't want affecting your work. Imagine how hard it would be to remove red paint from your canvas, when on Photoshop all you have to do is press Undo.