but how much does stuff cost?
Depends. What and where.
Rent in US is $2-3k/month(at least in the east/west coast),
Again, this depends.
In wealthy quarters of Athens, including north and south suburbs, rent can go higher than 2k for a 2-3 bedroom flat (something like 120 squared meters, you do the conversions to those funny numbers you use)
For normal Athenian prices, I guess 400-800 euros depending on size and neighborhood for small places, but it can go 800-1200 as well if you want something closer to downtown or if it's a new building or a good neighborhood.
Thessaloniki, that's probably 800 euros for a good sized apartment in a good neighborhood (there are higher prices of course).
In other cities it's relatively cheaper, but salaries tend to be much lower.
Islands aside of course, there are some islands where it's like 3k a month, there are others where it's 150 a month. Depends on which island and what season you're talking about.
Well, another US thing, we don't really rent cars that much. You may rent a car on vacation on some island if you don't take the ferry to get there, but we buy our cars. Ok, lots of people buy motorcycles. But you tend to buy a car (or use your company's car if you're lucky to be provided one)
Another thing is that cost of filling it up. It's like x5 more than what you're paying because 50% of what we pay is taxes... heck, we export it to other places and it's cheaper over there because they don't hike up the tax rate....
insurance is $200-300/month
This depends, as coverage is typically universal, but you can also opt to get private health insurance. Could be 30-250 euros a month, depending on age, health condition, provider and country. If you go for the more luxury global ones like Bupa, I guess it depends, but it can go north of 250 a month there if you get the full deal.
how much is that in Greece? So 50 or 80k might sound like a lot but after tax(fed, state, city..... when I was in NYC I got taxed by the City( . that is 20%-40% less then you have insane expenses
Average salary is like 15k gross. Annually...
That means it's less than 900 net.
Imagine that 2/3 of that goes to rent if you're on your own, 1/3 if it's shared. Then rest of it goes to circulate in the city, eat and drink.
How do people manage with such terrible conditions?
It's tough, but I don't know. I'm lucky enough not to be in such a situation myself, but I have a couple of friends who text me with a week or so left in the month asking me for 50 or 100 euros and they pay it back at the end of the month. So you can imagine how tight things are.