ThirdWizard said:Because life is complicated.
You build up enemies and allies. Enemies keep coming after you, and you have to do something. Allies need help, and you have to do something. Life goes on. Who can sit still when they've made their life on the death of others? Things just can't sit still around you, and its always one thing or the other, if only things would just stay right for a little while. Why are those zombies attacking your tower??? People have heard of you, come to you for help, for extortion, try to con you, need you to save the city, the continent, or the world. Old favors are called in, old friends you owe your life come to you for help. You go to them for help. And, when you're settled in again, it all starts over again.
This hits it right on the head.
I don't play a PC whose sole goal in life is to "explore dungeons, kill things, take their stuff".
That happens to be what my PCs do in the course of solving whatever problem comes up. And when that problem is solved, odds are good, a new problem will arise that will need solving. Usually, if I don't go solve the new problem, it will become a real problem for my PC. Therefore, my PCs may try to settle down, but will have to go adventuring again to protect what they've built.