I myself work full time and am going to school for Software Engineering. Right now job prospects in where I would like move don't look great since the last job fair I attended, I got the feeling most companies are planning to axe remote work ASAP. Which then limits my ability to move in the market place for jobs.
Often, the "more money" part is not enough to actually fund living and showing up for work, commute or not.
You cannot live on $17/hr in SF. Your post-tax income wouldn't even cover the the rent of a studio apartment. Not sure how you'd pay for food and transportation on top of that. Let alone actually doing anything fun that would make it worth living here.
That's 40 hrs/wk, of course. Many people end up working twice that, or more, across several jobs, in order to make ends meet here. And at that point I wonder why they stay.
The question is not why others can't; the question is how did you do it.
Please elaborate about your background, education, geography, occupation, whether you have a partner, children, medical issues, and what kind of home you purchased (is this a tent you set up in the woods, or a single-family house), how far it is from work, and how you get there.
Also please include any assistance you got from your family before getting to that point, including contributions to the downpayment, owning property where you could live without paying rent (or allowing you to live comfortably rent-free at their place), co-signing on the mortgage and/or student loans, paying for your education, buying your first car, etc.
Usually, the answer to your question is "because not everyone's parents are well off"; but let's hear your success story.