most who come here illegally live in squalor or are homeless, it's not easy to find a place to live when you have no papers or identification after all, but the reason they do that is because they had it much worse where they came from.
also, to proper immigrate, it costs around $11,000+ to actually become a us citizen, it doesn't take into account attorney fees, which you do need, it also doesn't take into account the classes you need to take which also cost money, then you have general living fees on top of all of that, or that you get disqualified if you make a single mistake on your applications or tests, including missing a period or comma in a written test. and if you fail, you get to spend all that money again.
oh, and until recently, applicants would just get failed regardless. that's what happens with a xenophobic president who tells USCIS to fail everyone, i suppose.
it also costs a lot to get a car legally, doesn't mean it's ok to get one illegally ---