Folk lore about snake venom has been around for centuries -- anything from it being an aphrodisiac to a cureall for almost anything, but mainly sexually transmitted diseases.
I guess I'm strange, I don't see the ick factor. I do see this as a a sad, horrid way for an innocent creature to die. And you gotta give the guy credit for being creative. As to the people who bought it, who knows, it might have had some effect simply because of their belief. You also have to consider that snake venom is a neurotoxin so, who knows, maybe it is more powerful than as Viagra (and easier to get in a bottle of vodka)?