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The bean counters will take everything into consideration, and they will calculate the correct speed to travel for maximum profit.
Going faster uses more fuel, but: you can do the same job with fewer ships if you go faster, which saves on labor as well, and goods at sea aren't doing any good. Also, slowing down may mean someone has $100M of inventory tied up in cargo containers.
One place where slowing down makes lots of sense is oil tankers in slow economic times. We probably have more tankers than we need right now, and oil inventories are high, so slowing down should cost very little and save a lot.
It's good of Maersk to run these trials, which gather better data for the bean counters.
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