People underestimate how nasty Mars is to live on. We'd be better off building colonies on the moon then trying to colonize Mars.
Imagine a nuclear holocaust on Earth, but far worse. That's Mars. The radiation is crazy. It's the equivalent radiation to being about 1 mile away from the center of the bomb dropped on a Hiroshima, every year. The air will make you pass out in seconds. The soil can't grow anything, not because of the UV radiation that sterilizes everything but because of perchlorates in the soil. You would need to live in a clean room on Mars because they build up in your system and slowly kill you. Never mind the low gravity.
And that's just scratching the surface. Mars isn't some nice place where we can set up a colony. It's a disaster zone of unimagined scale that no amount of money can do anything about.