People can and do use Bitcoin for things other than money.  You can send a transaction to yourself in order to permanently record a message in the Bitcoin blockchain which can never be deleted or censored.  Name another form of money which can do that.  

You keep focusing on bitcoin (the unit of account), but conveniently forget all about Bitcoin (the network, the protocol, the blockchain) and you can't use the network/protocol/blockchain without owning the the unit of account.  If you don't incorporate those things into your understanding, you will never comprehend why we see value and you cannot.