Money wise, it is probably more expensive to raise your own pork than to buy it. But I do it anyway. I know what it eats, and I know it isn't full of growth hormones and antibiotics.i don't think it is cost effective to purchase feed to raise hogs.. go to your green grocer and ask if you could have his unwanted veg n stuff he can't sell.. feed them to your hog..
We also get unwanted food from a local cafe. It save them room in their dumpster, and the pigs love it. We get 4-5 5-gallon buckets a week free food.