OP: you are forgetting: it's fun. there's a lot of people that love the idea of an internet currency. it's very fun. that alone makes it worth something. it's rare. people still seek old baseball cards. etc, etc, think outside the box!
People nowadays relay on bitcoin, because of this many people have no work, investing on something they didn't really understand. But if bitcoin gives them money then thats why they are still buying btc aside from its value.