Bear in mind that there are also going to be fees paid by the customer in order to get Bitcoins, unless they're one of the tiny number of people who mine Bitcoins profitably. Those fees are probably going to be enough to bring the total cost close to that of a normal payment processor even with the cheapest options.
Also, right now the value of their bitcoins will probably drop by more than 2.9% in the time between them buying the coins and being able to send them.
Comments
Bear in mind that there are also going to be fees paid by the customer in order to get Bitcoins, unless they're one of the tiny number of people who mine Bitcoins profitably. Those fees are probably going to be enough to bring the total cost close to that of a normal payment processor even with the cheapest options.
Also, right now the value of their bitcoins will probably drop by more than 2.9% in the time between them buying the coins and being able to send them.