Nowhere in the world outside SF/NYC is there so much VC money that can support paying developers those salaries.
I would say over 90% of tech companies make their money from local markets. You can pay your developers as much as you make from your local market.
As for hiring. You have no idea how well someone is going to work out. Some people are really good at interviews but turn out to be terrible employees and vice versa. This is why the hiring process in tech tends to be pretty convoluted and broken in general. No one can figure this out. The laws regarding hiring are also much less liberal outside of CA. Hiring and firing is severely restricted in many places.
Very few companies are in the position of being "unwilling" to pay developers more. Some with plenty of cash are even simply limited by the tax laws how much they can pay. The cost of paying someone too much over local market rate incurs obscene tax costs.