I have worked on agency produced apps made in Stockholm, and they were pretty crap as well. The agency charged about 3 times my salary equivalent. Paying a lot doesn't necessarily get you better work.
Of course it doesn't, but hiring people in a country with a functioning court system that follows the rule of law decreases your chance of being scammed. And at the very least offers a possible remedy if you are scammed.
Beyond being scammed, your chance of finding a great developer by looking for the cheapest developer is very low.
Beyond being scammed, your chance of finding a great developer by looking for the cheapest developer is very low.