Have you ever wondered why it is that we enjoy games so much? And have you ever wondered why it is that you dislike your job so much? What is the difference between pressing buttons on an Xbox and pressing buttons on keyboards?
The answer may surprise you: it actually comes down to your effort and how much you care.
You care about games and you make the effort because you want to get better at them and because there's constant variety and plot progression to keep things interesting. This makes you try harder in order to progress and that in turn gives you the feeling of reward that makes the gameplay satisfying.