If you've worked at various zoos, and want to get into peptide research->brain stuff, then why not just keep non-venomous snails at home, and work with the venomous snails at work? Best of both worlds, AND there's likely to be somebody present in the case of envenomation. I just don't think it's a good thing to keep super venomous animals (blue ringed octopus, cone snails, irukanji jellies....) in private aquaria unless there's 1) adequate antivenin on hand, 2) there's a history of exposure to that animal in your area. I think there's a similar argument for keeping "hot" reptiles.