There seems to be no reliable option apart from Paypal currently. 2Checkout chargeback fees are too expensive in my point of view. But then again, it really depends upon the type of product that you are selling and if chargeback rate is high. In op case, digital products have a higher chance of chargeback. I am not sure about OP but I own an OEM software retail outlet and accepting only Bitcoins as payment mode. Liquidated through localbitcoins.
Lost a lot of sales as I am using limited option for payment but the price of these softwares entice customers to go through the hassle for paying through bitcoins. So at the end of the day, it is worthwhile in my point of view.