The high wages of teachers in Boston, where nearly 3,000 are paid six-figure salaries, reflects the strength of their union and suggests that a district plagued by “chronic underperformance” may be more geared toward the adults running it than the children it serves, watchdogs say. A Herald analysis of payroll data found that 2,905 teachers earn more than $100,000 annually, compared to the average per capita income of $44,690 in Boston in 2019, the most recent year for which the U.S. Census Bureau has statistics. Those teachers earned six figures in a city where 18.9% of the population – about...