Its all about attracting the fluffies. lol.
They are there because sadly a lot of people when they are young believe they are possible. Some are just new to it all and don't know any better. Then you have some who are just stuck in a fantasy world of magick because it is better than their boring old life. There are some major sites out there promoting the mermaid shifting and spells to the point of craziness. For some of them, its like being able to live their fantasy tv shows they love so much. Hopefully though, those that come here for these spells, learn the truth about magick and stay to help the next generation of fluffies learn the truth too. I know back in my day, spells to become werewolves and vampires were huge. lol