Bitcoin fanbois point to bitcoin’s utility as a payment network. But, unlike Visa, holders of bitcoin don’t get any of the mining revenues, so there is no revenue stream on which to value a bitcoin.
Participants do need to have bitcoin to transfer funds, but they don’t need to hold it for longer than the transaction itself. Since bitcoin is limited to ~3 transactions per second, and average confirmation times are several hours, depending on network congestion, there is no need for more than a few bitcoin to accomplish all payments across the network. As an example, assuming 1 bitcoin per transaction, 3/sec * 3,600 sec/hr * 3 hr/confirmation = 32,400 bitcoin to execute all payments on the network.
Also, since bitcoin can be divided into satoshi, hundreds of millionths of a Bitcoin, there is no need to hold a particular amount of bitcoin to accomplish a transaction. The bitcoin itself just represents the transaction record, not the value of the contract, just as a record in Visa’s database represents the transaction, and is not in and of itself valuable, beyond the market price of the transaction mechanism (about 1%).
Even if holders of bitcoin shared in the mining revenues, the competitive mining market produces a flat fee per transaction, not a percentage fee, which allows the transfer of massive fortunes for a tiny fraction of a percent. It would be a much worse value proposition, for investors, than Visa.
The fiat price of a bitcoin arises from an artificial restriction on bitcoin supply & mining, and people’s expectation that these restrictions will entice others to buy their bitcoin in the future at a higher price. The “greater fool” theory. But this is separate from bitcoin’s utility as a payment network.
It is no different from other speculative phenomena such as Beanie Babies, baseball cards, and other artificially restricted commodities. People misinterpret the restriction as an ipso facto justification for a high price. Once all available cash & credit has poured into the commodity, there are no further buyers, the mania ends, and the price drops to the utility value of the commodity. In bitcoin’s case, its utility value is close to zero.