Here is what I don't understand - the chargebacks on PayPal I understand..
But what if I set up a CC gateway and accept payments, would it be the same?
What if on eBay I set up to sell a printed voucher and mail a physical representation?
Even if you send a physical item, which is how I sell on eBay, there is still a chance someone can charge back.
Many PayPal chargebacks are actually initiated through the buyer's credit card company.
If you run your own CC gateway, people can still charge back, use stolen cards, etc.
If you run your own CC gateway, you lose what little seller protection that PayPal offers.
If you run your own CC gateway, you have more ability to dispute chargebacks but you also have to provide your own infrastructure to validate buyer addresses.
If you run your own CC gateway, eBay is not going to be as easy to work with to resolve disputes.
Not trying to talk you out of it, these are just things to consider before jumping into a coins for CC venture of any kind. There are some failed attempts at this service which you can find by searching this forum.