[Cheburashka]

Southerners were businessmen who for the most part, used their slaves wisely and trained them to produce income.
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Umm, duh. A human being needs to be fed, clothed, sheltered. A slave owner will have to pay those monthly costs, as well as the initial cost of acquiring the slave, whether by purchase of by support of a slave child born to its slave mother until it is old enough to be put to work. The only reason you would do such a thing is that you expect to make a profit. Therefore the profit motive is the underlying basis and sole reason for slave holding.
Every slave (with the temporary exception of children too young to be put to work) had work to do for the benefit of the slaveholder. This is true of slave holding at any time or place in history. The implication that slaves in the South were were were utilized in any way differently than slaves in Greece of Rome is clearly erroneous. Training given to the slave is irrelevant.
Slave holding was never charitable work, and never done for the benefit of the slave.

[Chickensoup]

Slave holding was never charitable work, and never done for the benefit of the slave.

I didn't say that. I said that the business men used their assets to turn a profit.