Selling and breeding more rare animal is something that interested me.
I like to sell more exotic animals for profit because without people like me local people will have to way to experience what is sold away from the pet stores. You would be surprised how many people do not use forums.
I'm not trying to get rich off snails, but when I can sell a few of them and upgrade something on my tank or to buy something else that interest me it's well worth it. People could say the same thing about no profit in plants, I have done very well with this and has paid for most of my aquarium setup.
Cherry shrimp sell for $3 per shrimp at the petstore who want to buy from me. 50 babies = $150. pretty good profit. The only money I spend on the shrimp is water changes.
I don't know anyone away from here that has heard of assassin snails. Once they multiply, I could make a pretty good profit and give people experience to a very unique type of aquatic snail they never knew existed.
Nerites sound interesting, but they go for about $5 per snail, not sure how much they reproduce? Some petstore can already order them in anyway.
After I sell most of the remaining ram snails and get my tank settled in to move my Nerites to my main tank, I will probably be buying some assassin snails. Rabbit snails are very cool snails, but the size is a little too large.
I asked here to see if there was snails out there that I never heard of that might be cool to breed, But I will do the assassin snails
What's more cooler then a killer snail? lol..