It's only 5th because there's so many of them. Just look how much one is actually worth.
Of course it will have a low price compared to bitcoin because of the quantity. But the same can be said about 42coins. It's so expensive look at it, it's worth much more than bitcoin! When in fact it's jsut because there's so few of them. It's 5th because people actually have given it that value and maintains that value.