At Elevator we charge $45 per run, single shot all chems, 4 rolls of 120 or 6 rolls of 35 or 10 sheets of 4x5, or 5 sheets of 8x10. We can do up to 16 x20 .
as you can see single shot and one run at a time, if you have one roll of anything to run then it is $45 bucks( we do not hold single rolls until enough clients walk in the door, and rarely do we do a single roll run. Our turn around is about 3-6 days .
I am about to process a single job that consists of 300 4x5, 200 8x10 and 50 rolls of 120,all single shot in Pyro, this will work out to about 85 runs that I have to inspect each film as it comes off and then contact them. To me our prices are fair as this is a lot of work and considering the film, travel,time from work for the photographer our film processing is minimal.
If a lab isn't otherwise running reasonable volumes of Black & White, and they have to do a special run just for your film, the lab will lose money at that fair but admittedly expensive price.
If the lab provides custom processing for every batch of Black & White they process (individual adjustments) then the price is fair (compare with Elevator in Toronto).
The only factors that permit labs to charge low prices are volume, mechanization and standardization over many rolls.
So before you leave a film with any lab, make no assumptions about either: 1) type of service being provided and 2) the price.
Now it may be that the OP made those enquiries before leaving the film, and is just now trying to get some perspective on what the lab charged.