I live in Indonesia which didn't even make the list of "cheap cost of living". There is a HUGE difference in the cost of living - mostly for those things produced or grown in-country. Fruit, vegetables, fish, beef, chicken are 1/4 the price of what it is in the US.
Imported products, like cars, air conditioners, TVs, etc. are about 1/2 the cost of the US. Why? Because the cost of transportation, retail stores, employee salary, etc. are all lower. In the US, the typical item imported from China is marked up by a factor of 20. Simply unloading the container at the dock is expensive in the US.
Another factor is the standards - cars don't have air bags, emission controls, fancy electronics, etc. so they are about 1/2 price. The price of registration and a driver's license is about $20. No sales tax. No gas tax. No income tax. My property tax bill was $1.70! The cost of a skilled laborer is $5 per day; a general worker is $3 per day. A maid or gardener is about $40 per month - I have 3. Materials such as wood, stone, roof tile - everything that is made locally - is very cheap. No building codes, no insulation (not needed).
Health care cost is hundreds of dollars not $10's of thousands, so I don't need health insurance. I pay out of my pocket. If I get a broken leg, the cost is $150. If I get a brain tumor, I die - I don't care! I can buy blood pressure medicine, thyroid medication, and a few other things for less than $50 per month.
Airplane trips to exotic places like Singapore or Hong Kong is about $300. A two week trip back home to the US costs me about $3000 (cheap hotels, rental car, take the train, etc.)
You total up all that stuff, and I can live like a king on $30,000 per year. Oh yea, my house and 1/4 acre of land near beach would sell today for about $100,000 - I have a nice house. Oh, yea, satellite computer dish, and satellite television - that's modern enough for me.
I loved learning a new language - it keeps my brain active. Plus English is universal for everything important. I only need the local language to bargain at the market to get a local price rather than the tourist price + helps when flirting with the young girls who love to hang around to watch TV and eat good food.
Maybe you need to take a realistic look at living overseas - and not just the old ideas you have in your head about 3rd world nations.