To most of us who love the game, this question is a non-starter. It's along the lines of "why breath?" Egypt "why drink water?" However, there are many people out there who have not yet been turned on to the amazingly fun world of billiards gaming. Originating in the 15th century, pool is one of the oldest sports still played professionally today. Previously it was reserved for members of European higher society but since then it's become widespread and enjoyed by people of all ages.
Thanks to advanced technology (like many of our favorite sports games) it's possible to play pool on the Internet! Granted, there are certain physical elements missing, but it's a great way to work on your mental strategy and these games are designed to mimic real-life physics in a way that actually prepares you better for a real-life game. Tomorrowmore, it's tons of fun and it's a great way to interact live with other pool players from across the globe!
Playing pool is an excellent skill and since most bars offer the option to play pool, it's also a nice social trick to have up your sleeve. Lots of players are sharpening their skills online in order to be able to perform significantly better when they're at their local bar or pool hall. Even those who are not looking to go professional can enjoy the fun online atmosphere and reap the benefits when they play with their buddies, especially if there is some friendly betting involved.
For those that are learning, it's a great skill to have. The rules are fairly simply and strategies learned on one form of the game can easily be transferred to another. It's easy to start playing, and you'll have lots of game options once you've got the basics down. Playing online is great because you can play at your own convenience from virtually anywhere with internet access. You can play against live players or you can practice against a computer. It's easy to get started and all the games are free! The only time you'd pay money is if you're playing on a site that offers real-money play for real cash prizes. Important to note that even on the real-money sites, you still have the option to play free online pool through the practice modes. And remember, practice makes perfect!