You are assuming just because it's Pittsburgh pay from companies like Google, Apple, Amazon and Uber will not be competitive. If there is any discount on salary it's on the 10-15% range, not 50%.
software developers for amazon in Pittsburgh make between 56 and 107k, 78k mean (glassdoor).
Sanfrancisco, its 76 - 131k, 102k mean.
A side note. The cost of living here in Pittsburgh is much, much lower than in SF or in NYC. According to a Cost of Living calculator, to maintain the same living standard in Pittsburgh at $60K, you have to make $137K in SF.
In the internal Google salary survey, controlling for level and tenure, salaries in Pittsburgh are within 10% of salaries in Mountain View. Moving to Pittsburgh is similar to getting an enormous raise. However "controlling for level" masks the fact that Pittsburgh is Siberia, far from the palace court where it is harder to be promoted to a high level.