1. A companies lame way to make monkey by selling brine shrimp (the things that you can buy to feel your tropical fish @ the pet store for 10p).
They charge you almost £10 for a tank and "food" and call the shrimp "sea monkeys" as though it somehow magically transforms them into something that's actually worth keeping a a pet.
In reality, brine shrimp are food for tropical fish, they are not pets. They cost 10p a bag at my local pet shop and they can be kept in an open jar in the back garden for years and survive from bits of leaf etc. that fall into it naturally. But who would want to keep them for years anyway, it's much more entertaining feeding them to guppies.
2. A way for parents to please their annoying bratty kids ... because this is the closest they are going to get to letting them have pets.
Child 1: Check out my sea monkeys, they are so cute!
Child 2: Those don't look like monkeys, they look like floating bits of insect. groce.