You can enter Mexico, and they have only checked I had paperwork/passport about one times of ten. No reason why you can't do the same thing if you want to do currency arbitrage. Paraguay will give you a residence permit pretty much just for showing up if you can get ahold of a USA passport, or you can avail yourself of the compact of free association and live in Micronesia without a visa. The arbitrage game is for everybody.

That works for a bit but eventually friends get sick of it, and if they don't a baby is born and it suddenly becomes real weird and very obvious you are intruding on the baby. There is a timer ticking in this scenario. By the time all your friends have kids the chance you can stay anywhere reaches ~zero.

Having actually built, planned, and done all the paperwork for a house myself most the extra costs that can't be worked around (you can DIY everything if you want) is permitting, inspection, and codes. I just didn't get my house inspected nor did I submit engineered plans, so saved tons of money, but most people don't have the option to bypass 'safety' inspections and they get gutted like a pig following all those rules.

The actual materials cost of a house, you can build one for $60k no problem and absolute shit-tons of cheap land near jobs (ex: unemployment extremely low in the Dakotas, cheap land, high demand for homeless-tier labor in the fields in bumfucklandia as ICE deports illegals making farmers desperate for anybody).