That's because of the network that the others have. Bitcoin has been around for a very long time. On the other hand, Ethereum invented smart contracts + there are those ICOs. BTS right now is an underdog like how Apple and Tesla started. They're more focused on improving the technology and the experience of users. In addition to this, people who influence the price the most are probably the same people who have been successful in Bitcoin and ETH since they were first created and they probably already have companies of their own that spread the word about Bitcoin and ETH. Just wait when projects like the Sovereign Hero and even EOS press the big button. Watch out for 2018.