Re: Quid pro quo
"if you are being flexible by travelling long distances on your own time"
This is why I charge for the travel time as well (assuming it's not a usual location I'm going to). Once a client queried it (as in - why are you doing this?) and I simply said they were paying for my time. If they wanted me to drive for 6-8 hours for a 1/2 hour meeting that was their choice, but they were paying for it.
Amazing how requests for on-site meetings dropped after that :)