[DiogenesLamp]

But if, instead, Southern planters themselves owned the goods imported through New York, then they must pay the tariff themselves and so have standing to complain.

[BroJoeK]

DiogenesLamp: "Since the North only produced 25% of the exports, they would only get 25% of the incoming European trade."

All depends on your definitions of "North", "South" and "total exports".
Deep South cotton was undoubtedly 50% of the total, including specie.
But everything else classified "Southern" could be and was produced in the Upper South, Union South, Northern Border and Western states.
This was proved conclusively in 1861 when all Confederate exports were deleted from Union totals and yet "Southern exports" excluding cotton fell net-net only $3 million.

Finally, 1860 Northern "exports" to the South totaled about $200 million, which explains the source of funds for Northern imports from Europe, and puts the lie to claims that "Northeast power brokers" were ripping off the pooooor Southern plantation owners.