Here's an interesting little datum for y'all.
Over the last 20 years or so, the median cost of launching a kilogram of mass to low earth orbit has dropped from very approximately $20k to very approximately $10k. Per kilogram.
Another: In the same period, the global GDP per capita has increased to about $11k. Per human being, per year.
Getting to Mars within a human time frame takes over twice as much delta V as getting to low earth orbit. That doesn't make it twice as hard, or half as efficient. It's a lot harder and less efficient than that. Basically, to get to Mars from orbit, you have to start with all the same resources that you would have used to get the same payload to orbit from the ground. At $10k per kg of everything, that gets really expensive really quickly. And that assumes you won't be trying to come back.
It costs as much to put a kilogram of anything into low orbit as the average human produces in a year. We can't afford, apparently, the cost of putting the brakes on runaway climate disaster on our home planet. Yet some people think we can afford to colonize Mars. I think they haven't done the math.