Because this is new technology in it's exponential development!
![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
This. Everyone is trying to make the next big coin, so they can strike it rich. However, what it is actually doing is creating a lot of innovation (and a lot of spam). The coins that are bad will die, and hopefully new coins will take the best aspects of the ones that fail to make a very neat coin.