Because ETH is a lot older and it's run by a snake called vitalik. 
ETH is not older. They are exactly same old. Since was same coin for more then a year. and shared same blockchain, that is now ETC blockchain. If we look that way, ETC is older since host the original blockchain, but practically they both share same blockchain till the moment ETH decided to go separate way.
It's crazy when you say that ETH is not bigger, look at the value of ETH and ETC now, ETC is not even equal to 10% ETH. It is a very small value for a coin of the same origin.