You see, the problem here is that too much has been made of eating and not enough of their labor. Figure how much they are worth in terms of hard labor, or enforced prostitution, and then sell them for meat after they start to break down.
Seriously, the price of eating a still attractive or still able slave should be a delicacy available only on the richest occasions. I've had it up to here with complaints about meat quality--the deliberate fattening and conditioning slaves for future consumption generally involves huge expenses in labor and materials. To say nothing of the fact that they often kill themselves prematurely rather than endure the conditioning. (They say that force-feeding slaves is one of the most traumatic parts of the process. They litterally shove a tube up their nose and into their stomach, gag their mouth and other orifices, and pump something like 5 pounds of corn oil into their bodies each day. Small wonder stomachs taste sweet and honeyed.
And then there is the whole crazy method of amputating their limbs, to decrease their caloric outtake. Generally, they use an acetylene torch without anesthetic to achieve this.
The question, I suppose, is whether industrialized consumption of slaves is immoral or indecent. Perhaps this issue can be resolved with the creation of an organic pasturing system, where selected slaves live something of a normal existence before they get eaten. Darn pricey though.
[OOC: I'm not a Wacko. Just so you know]
Sickos!