You're not going to answer, so maybe I can get you to react to a guess. Let's say 5% each for shipping, warehousing, insurance, losses not covered by insurance, sales commissions, and interest. That's 30%. So Southern plantation owners stood to add 10% extra profits by cutting out New York merchants and banks, while adding ALL the risk for the entire pipeline. Not to mention tying up all their capital and/or going heavily into debt to finance expansion.
With thinking like that it's no wonder they lost the war!
I think it would have made profit. It would have been a net gain, instead of a net loss. Well, a net gain for the Southern companies anyway.