Yes it is well worth it, we raise pigs every year for our personal use and it works out great. Feed is pretty inexspensive and I feed allot of scraps from the grocery store throw aways, pigs convert feed very well 4lbs of feed per 1lb of meat. you can butcher anywhere between 170lbs and up, I bring mine to about 350lbs before processing because I like bigger bacons and hams,shoulders,roast.
As far as cost go it runs me $.35 per lb for processing a one time $25.00 kill fee and that's it, they cut wrap and package to your spec's, and make sure to save allot of things most people do not. Like Kidneys (fish bait), Liver (cooking or sausage), Save the jowls this what is used for salt pork. save the head and all the byproducts for the dogs love them. Then I have my guy who cures my hams, bacon, salt pork, ham hocks, if you like they can also make sausage for you. with that said and done all of your meat will only average out to about less than $1.50 per lb, now you can't beat that and the meat isn't laiden with growth hormones and chemicals. It may sound daunting but it is not and well worth the money.
AL