Heliciculture is a big word to simply say "snail farming". There are a few people that raise snails, since many people in some areas of the world eat them, and it seems like recently they also started consuming their flesh. Their slime could also be used for cosmetic, but that doesn't interest us here. I'm told that you could also get some serious earning with a snail farm. But remember that it's not easy, and expecially at the beginning even if the first snails will lay a lot of eggs, very few of the newborns will survive. It can also be pretty expensive, depending on how big you want it to be. Have you ever heard of it, or tried it?