Every motorbike shop has the tooling amortized already. It takes less than 5 minutes to swap a tire and motorcycle tire tend to be cheaper than highend bicycle tires due to economy of scale.
The Honda NC750 isn't a superbike, there is no reason to spend that amount of money on 2 tires.
Ok, you go tell that to the two shops within a reasonable distance to me. Last time I tried telling them that they didn't budge.
I'm well aware they're charging a lot for it. They do it because that's what people around here pay for it. And given they've got a few days of work queued up before they even got around to fixing up the fork tubes I removed for them, it seems like they're not hurting for business charging what they charge.
The Honda NC750 isn't a superbike, there is no reason to spend that amount of money on 2 tires.