The driver scenario is pretty common in larger metropolitan areas, esp Northeast and West. And usually pretty "agency" oriented. The rest of the ploy is usually a doubles offer for another $100. Or goes extremely well with "cash and dash" for the former Craig's list and BP crowd, when accompanied by pimps or male driver.
Unless you know the provider well, residential outcall is pretty risky, for the above stated reasons.
At any rate ladies, while we'd like to support the traveling visitors, it's just not cool to "shit in the nest" so to speak. Sometimes you're better off just licking your wounds. Perhaps the better way to warn other providers would be the Powder Room, not in public where you piss off the entire community. Just a thought.