Someone else in one of these canal threads said that Egypt charges slightly less than it would cost to sail around Africa. If that's true, that Egypt is probably capturing around as much value as is possible from the canal.
That example was pretty idealized, starting and ending very close to the canal. Most voyages are probably not affected quite as starkly by the canal, and I doubt the canal can or does charge ships based on their overall itinerary.
> I doubt the canal can or does charge ships based on their overall itinerary
You'd be wrong there! They actually have a rebate system[0] based on a number of factors including origin and destination. Basically, they try to make it so that its always cheaper to go through the canal, rather than sail around.
