Still, why throw away effort already invested
And really as I said, considering immersion
they make much more sense in Europe than e.g. in Africa or Port Royal.
Because bringing sugar to Port Royal was kind of like bringing salt water to the ocean ... in fact Port Royal exported sugar itself.
And Africa also did not really have any industry to use the sugar and the population was poor anyways ... so who would have bought tons of sugar?
At most it would have been bought in small amounts at extremely high prices by the few rich white traders that lived in the trading settlements.
Europe was the market that bought "raw goods" to refine them to "produced goods". European Nations bought as many "raw goods" as they could.
Africa and Port Royal had hardly any industry to refine anything and produced enough "raw goods". They however bought (or traded for Slaves) some amounts of "produced goods".
That was the "core principal" of Triangle Trade.
America (incl. Carribean Islands) to Europe: Raw Goods
Europe to Africa: Produced Goods (some to be sold in Africa directly, some later in America)
Africa to America: Slaves + European Produced Goods not sold in Africa