I can think of a thousand better reasons not to own a person aside from increased productivity.
The Caucasian Invasion Of Racial Justice Spaces
The DiDi Delgado
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Just because you can think of additional reasons does not mean they were wrong. Believe it or not, there can be multiple arguments for a particular social order.

Also, you are completely ignoring quotes like this from the very document that you cite,

[Our ancestors’] grievances, great as they were, were trilling in comparison with the wrongs and sufferings of those for whom we plead. Our fathers were never slaves — never bought and sold like cattle — never shut out from the light of knowledge and religion — never subjected to the lash of brutal taskmasters.

Clearly, these people had more concerns than the financial well being of the slave owners.

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