I like Alan Watts' way of talking about this. Imagine you're omnipotent. You can do anything you want at any time. He makes a really insightful comment in that after a while, it just gets boring. Being all-seeing, all-knowing, and all-powerful is no fun. Think of a full-expenses paid tropical resort vacation for the rest of eternity. There's no challenge, no lessons, no sense of urgency, meaning, or sacrifice in such a life. There's nothing on the line. It's just massages and margaritas and rich food and pleasantness. Imagine watching a movie of some guy just hanging out at a resort in a state of indulgence. Then compare that to watching Lord of the Rings. There's something much so more interesting about the story of a struggle for goodness against all odds than an eternal cosmic resort vacation.
So the most interesting thing that God could think of was to create a game - a very dangerous and deadly game, where the stakes are high, where everything is charged meaning, where there is suffering and sorrow, and also triumph and joy, heroes and monsters, secrets, intrigue and plot twists, all dressed up in the most sophisticated artistry, song, costumes, the whole shebang. So the DCM split into countless sparks of light and arranged these Souls around in various densities, or states of limitation, darkness, and ignorance, amnesia. The game is one of endless discovery - or as it is put in The Wave, the quest of the Knight Ones. The all-important rule to the game is that of Free Will, or the choice between good and evil, STS and STO. That's what sets the whole thing running. We're in a live action role playing game called here on Middle-Earth. 5D is sort of like Rivendell, except without the looming tragedy of the exodus of the elves.
And I think we chose to participate in it for the same reason we read a good story or play a game here in 3D - because it's fun!