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!
maybe because i think is they can have a bigger profit on buying bitcoin we all know already why we are buying bitcoin just like what we are doing trading we can have bigger profit, we can have it when we buy bitcoin in lower price then after that we can sell it in higher price thats why people are still buying bitcoin.