I have no idea how much a MSC may make for a shop, but it has to be enough to cover their expenses (scheduler's time, editor's time, overhead) plus make a profit, so I would imagine it's in the hundred dollar range at least.
As for your situation with the scheduler, they may be speaking the truth, but that's not your problem. They don't want to loose money, neither do you. Hopefully they can find another shopper closer to the location to fulfill their contract.
proudly shopping in the D.