I think you can play an mmo for several reasons.
One is exploration and adventure. The thrill of finding new places and things that you'd never see in real life.
The second is community. I've made a lot of real friends in mmo's, and still keep in contact with many of them
The last, which a lot of people won't admit to, is the fact that mmo's replace achievement and progress in real life. They give the illusion of power, riches, and achievement with very little hard work required. If you don't have any of these things in real life, an mmo will give you a sense of having accomplished something. Then one day you realise it is actually an illusion, and you're neglecting your life and the people in it, and either go cold turkey or scale back massively.
One is exploration and adventure. The thrill of finding new places and things that you'd never see in real life.
The second is community. I've made a lot of real friends in mmo's, and still keep in contact with many of them
The last, which a lot of people won't admit to, is the fact that mmo's replace achievement and progress in real life. They give the illusion of power, riches, and achievement with very little hard work required. If you don't have any of these things in real life, an mmo will give you a sense of having accomplished something. Then one day you realise it is actually an illusion, and you're neglecting your life and the people in it, and either go cold turkey or scale back massively.