Not sure about flipping burgers, but all supermarket chains pay a minimum wage of 4000 CHF (4200-4400 USD) per month, with 4 weeks of paid holidays. Taxes on such a low income would be quite low (15% payroll and 10% income tax). Health insurance is around 200 CHF/month per person, with a 2500 CHF yearly deductible.
Note that rent, food, etc is also scaled accordingly. (Not a bad deal in the end, especially considering the cashier/waiters/etc earn enough to live decently).
Some people do that. You can save more, I guess (but the housing market in fr and de is already going up due to that). (You can also live in CH and go shopping abroad if you're cost sensitive)
2000.- isn't poverty level and more than wellfare would pay - but not much more.