I always wondered why people would consider living there. You really wont be able to live on the surface so you will be stuck indoors or in sealed caves (this is the foundation to just about every plausible colony plan) and basically no useful magnosphere to speak of.
To me this is the same as living on a space station, the moon or underwater. All of these are much cheaper, easier and safer. What am I missing? What does mars offer outside of just being "interesting"?