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Okay but why would anyone actually want to live on Mars? You basically have to live inside 24/7 in quarters that are probably quite similar to a submarine, with crazy rules and regulations to make sure nothing goes wrong. It's just not very appealing to the vast majority of people, and with the demographic crisis on earth, it really doesn't seem like something many people are going to volunteer for.
And yet people voluntarily sign up to live on submarines for stretches at a time, under military rules and discipline, and with the knowledge that other people may try to deliberately kill them. I think you are engaging in far too much typical-mind fallacy.
I also think that you would only need a relatively small cadre of pioneers to establish the core infrastructure that would enable building out more comfortable living for larger numbers of people. Submarines are unusually cramped due to the tremendous forces needed to protect the low-pressure space. Using cut-and-cover construction, building larger-volume spaces is fairly straightforward (and structurally easier than on Earth due to the lower gravity).
Plus the history of maritime exploration. Original efforts at making it to Asia/America/whatever came with significantly higher chances of horrible death than a well-funded Mars mission
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The conditions you describe are most applicable to the very early colonies. There are enough people with a risk-appetite large enough to consider the journey, especially if they're getting paid.
Funny store. My first interaction with Scott involved him responding to an essay of mine, our exchange evolving with him then encouraging me to consider rather longterm dreams I had like becoming a psychiatrist on a Mars mission. I'd take that up for a few years, especially if I was getting paid big bucks. A mere million USD would convince me to take the risk and tolerate the inconvenience.
The first colonies will probably live In grounded Starships converted into habitats, or in relatively small colonies covered by regolith. But once ISRU is running (and there are many ways to get easy concrete substitutes on Mars), there are few limits on how big and luxurious habs can be. You could have pretty large houses or apartments in hab blocks, as long as you keep the whole thing sealed, which was the plan anyway.
Even the journey wouldn't be so bad with a Starship. The modeled crew quarters would put earlier missions to shame.
Do I particularly want to go to Mars? Not really, though I think it's kinda cool. I'd be much quicker to sign up for NEO stuff, because of all the convenience that entails. But there are enough people who can be swayed when there's 8 billion people to draw from. People sign up for 6 month stays in Antarctica after all.
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