Earlier quoted context omitted.
It's doubtful we'd send people to Mars as a one-way trip (though some regard that as a reasonable cost-cutting measure). The day-night cycle is almost the same. We don't know what extended time in ~40% gravity would be like, but people have lived for an extended time in zero G, which is a much more extreme change. Sailors on submarines have survived in tight quarters without natural sunlight or wide-open spaces for e…
Okay, but why ? What is anyone's purpose for going to mars en masse? Migration to the New World was spurred on by the promise of wealth, resources, and independence from existing governments. The latter is utterly implausible when you consider the total dependence colonists would have upon supply from the nations they're hypothetically fleeing. The former, well, again I suspect dependence upon supplies from the home-…
A lot of scientists would want to go. Ordinary people might too if they were feeling adventurous and if Musk is right and we can send people at a relatively affordable cost. There will also probably be a lot of workers to do the things that are physically demanding and not very much fun. If they're paid more to do that work on Mars than on Earth, then it could be a good deal.
Some people might want to stake a claim to some land or participate in the creation of a new government. There might be valuable natural resources like gold or platinum that make the transportation and infrastructure costs worthwhile.
Some old people might prefer walking in ~40% gravity to being confined to a wheelchair on Earth. Some people might be sick of working on made-up first-world problems (like how to get more people to click on ads) and creating shareholder value, and want to do something more challenging and more rewarding. Some people might just prefer the company of the sort of person that would move to Mars.