To Matt's original point.....why isn't there a marked channel there? It would seem the charter companies would collectively decide this is in their best interest. It does not seem cost would be a factor.
For years there was no channel markers b/t North Sound and Oil Nut Bay, and for that reason it was redlined. Once they put the channel markers in, almost all charter companies allow passage there.
When you insist charterers go "all the way around", as MrEZgoin describes, it seems you invite some to attempt the route south of the Camanoes rather than between them. I've never understood this.
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