You see, that's the problem of many people in this forum: They are detached from the real world.
A non-citizen person can have a comfortable life on USD 30k in RO, BG, HU, CZ, SK, SI, HR and even in the northern part of Portugal.
A citizen anyway doesn't need USD 30k in these countries to enjoy a good lifestyle.
Switzerland: A citizen can still︀ find a flat in the banlieus for CHF 600.-. Nothing fancy but o.k. .
Then use public transportation (much cheaper for savvy locals than you might think) which will set︁ you back about CHF 250.- per month.(includes weekend trips to other parts of the country).︂
Buy groceries with a discounter. If you can go without meat (much healthier to be︃ vegetarian) this will cost about CHF 600.- (incl. going to the Beiz for a beer︄ almost daily).
Add about CHF 100.- for utilities.
The remaining CHF 850.- are for whatever︅ you want to use them.
Note: With this low income there is no need to︆ bother about taxes. There are certain tax deductions which you automatically get and that way︇ this amount will go almost untaxed.
A citizen will even get some social benefits if︈ he/she applies for them separately. "Kantonale Wohnbeihilfe" will easily cover four to five months rent︉ (= CHF 3'000.-).