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The line loses the opportunity to sell the profitable on board items when someone leaves early and they have quite a bit of logistics to set up to properly disembark someone early. The savings from someone leaving early are probably negligible.
You don't need any of that - just buy 100 shares one day, sell them the next (hopefully on an up day) and use the buy transaction to keep getting the OBC.
Gibraltar port schedule Schedules | Cruise | Gibraltar Port Authority
There are no listing for RCI ships as of now that I can see.
I assume others with better port schedule links (like @SummmerInKefalonia) can provide more info.
Biker, who thinks this might be the most inaccurate early port schedule guessing thread yet.