Matt, I have run Doria trips for years. The logistics when we have non-local clients is huge. But we are set up for it.
Here is a link to our current trip.
TDL DORIA TRIP
Our trips are typically more expensive than some others. But that is because we take fewer people and have more support persons and equipment. The last thing I want is a client arriving from Australia and having his equipment lost in transit and not being able to dive. We bring full back up gear down to the last fin. Plus we have real food, not just hot-dogs. I also hand pick crew that can ensure a quality trip.
Even with all that our trips are a pass-through for us. Meaning my costs to do it and my revenue just about match up. There is no profit on these trips.
I have been on 14 expeditions and led 8 of them. It's a huge amount of work.
Cheers