It's actually not a joke. There's a lot you can do with a worm farm (I mentioned a few things in other comments). I also happen to know that there's a shortage of Super Worms in the major city that's near my home. It's a sustainable farming opportunity. The worms feed the livestock while eating much of the waste. If I decide to start a worm-farming operation I'll likely also pick up some chickens and create a small pond. 100% bug-fed chicken eggs are amazing and bug-fed fish will be better than anything the fish-farms produce. It also provides opportunity to sell feeder food to pet stores/zoos and bait to fishing supply stores.