1- Videogames are fun
2- Videogames are a good way to relax
3- Videogames can help you against boredom
4- A good game is nothing less than a good movie
5- While playing you can both distract yourself or have more time to think, depending on the game you're playing
6- Videogames can improve your creativity and fantasy
7- Kids nowadays are smarter also thanks to gaming
8- Good videogames are a pleasure for your life
9- Some videogames, like online ones, are a good way to socialize
10- Thanks to videogames you can get the chance to join forums like this
These reasons were in no particular order. They're all valid to me.