Here's one, people want to use bitcoin for transactions, as these blocks of transactions fill up, new hashes are needed for each block. The miners are finding these hashes and facilitating the continued use of the blockchain. I'm hazier on this one, but I believe transaction fees go to the finder of the hash? Anyway, wouldn't the value be is the protocol/platform itself, that's what people are buying in to, they want a usable, distributed ledger.