In nature, pigs roam a large range so they don't cause lasting damage to the local vegetation. Large meaning hundreds of acres.
Pigs will root around the ground looking for food and can damage the trees. In palm oil plantations, especially with young trees, this is a big problem. They're not picky about food so any smaller side crops like sweet potatoes or vegetables on the ground will also be damaged. If you've seen the places a herd of wild boars have foraged you'd understand. In this respect they do more damage than the value of the meat can offset.
Secondly, the fencing will need to be extra strong so they don't escape. These guys can dig under normal chain link fences.
Thirdly, you can probably put about twenty individuals in an acre before they start messing up the trees enough to cause crop yield to drop. Given the low density you'll then need to stalk and shoot them to get the meat. The confrontation that may follow when a plantation worker encounters one could also turn risky. Females tending a brood are known to be aggressive.
Last thing that comes to my mind is living out in semi wilderness carries higher risk of sickness and parasites.
Again, is it worth it??
