Earlier quoted context omitted.
Paying conductors a living wage isn't nearly as expensive to the agency (and the state, and we the taxpayers and riders) as mismanaged and corruptly nepotistic multi-billion dollar contracts for construction.
On the other hand, paying living wages to thousands of unnecessary workers is quite expensive, regardless if they are employees or contractors. Unions work on both goals simultaneously, increasing wages but also providing job security to their base, inserting strong restrictions on who can perform certain labors etc. The more employees, the higher the power of the union, it's not like a competitor could spring up and…
On top of this, but actively lobbying against having driverless trains and other cost-saving technologies leaves NYC with the most expensive and antiquated system in the world