This happens all the time in Bermuda. There will be 6 who book direct with the the Bermuda tour operaor and 6 who book with cruise lines and pay twice as much. I looked at the excursion prices when I was there on Oceania and they charged about two and a half times as much as booking with the Island Tour Centre. Everyone is all togethrer on the excursion paying a different price booked direct, booked Celebrity, booked Oceania and booked Viator.