Uhhhh, what?
There is one consumable component on the trolley pole - the shoe. And if it isn't being used, than it isn't being consumed.
The pole itself costs about $200. There's probably a similar amount again in the circuitry in the car that allows the operator to choose between which power collection method he/she wants to use.
So no, it is not costing them "tens of thousands" of each.
Of course, the point that you are missing is that the TTC used the exact same spec for this because it was an option to the existing order.
What is cheaper - reusing an existing spec to allow for improved pricing on an existing order, or to rewrite the spec to save a couple of bucks, but potentially a significant cost escalation in the per-unit cost?
Dan