Bitcoin transactions can cost 30 US dollars.
Alright, firstly, that only occurs during serious network congestion, which is rare phenomenon. Secondly, as a vendor, you're not obligated to exclusively accept Bitcoin. I don't use Bitcoin for low-value transactions. Monero, for instance, is significantly more cost-effective.
Currently, Paypal imposes a $20 chargeback fee in the majority of countries,
excluding the extra cost that's included if the situation escalates into a dispute.
That $20 chargeback fee is
still cheaper than what you'd pay for the necessary Bitcoin transaction to send the money back in that situation. And of course for that $20 you are mostly paying for
administrative time, which would be the same amount of work regardless of the technical means of the transaction. That means that in a Bitcoin scenario, you'd probably pay the $30 for the Bitcoin transaction
and pay some company
another $15 to mess around with the legal/contractual situation around the chargeback.
And through all of this, we've been talking about the old, slow, outdated system known as "PayPal'. The future is
pure digital currencies that are
not based on blockchain. My company's transaction fee is baked into the name of the company:
one haypenny, or $0.005, or one half of a cent. That's the price of all transactions, no matter how big or small, and transactions are completed in under 10 milliseconds, and credibly scaling to handle every daily transaction the occurs by the human race on a daily basis.
Blockchain-based currencies are simply non-viable for mainstream transactions. That's why nobody has made this happen, despite billions and billions of dollars in hype that has been lavished on the idea. Blockchain will stay around forever as a means of providing investment instruments, but consumer transactions are quite another story.