Chargebacks are a part of doing business any time you accept credit cards, whether paypal is your merchant provider or not.

The problem here is Visa/MC/Amex etc. Since you almost have to accept credit card payments these days, you're stuck with their terms. Since the banks all provide credit through these card providers, there's very little competition.

There are numerous ways to virtually eliminate CC fraud but the card providers aren't interested in taking those measures, and neither are the big retailers. They are happy to accept the ~5% loss on chargebacks, because credit card users spend something like 30-40% more per transaction than cash payers.

What we need is a competitor that disrupts credit cards altogether, not just merchant processing. Eliminate VISA and MC, who are basically skimming 2.5% off our retail economy. Cards are obsolete anyways. The processing side is obsolete, we don't need terminals that dial into a central processing machine, we can use the internet. The credit side (banks provide the credit line you get on your card, not Visa/MC) will take a bit more work, but we can combine it with the rise in peer to peer lending: you seek a credit line from a crowdlending site, not Chase bank.

The same way AirBnB does it: verify everything (phone, email) and provide social context ("You and the seller have 2 friends in common on Facebook"). You could go a step further and remove as much anonymity as possible.

Of course, there are other ways to stop fraud which you'd want to do as well.

If you look at Paypal's 10-K, they assume an automatic writeoff 4% of their revenues due to losses from chargebacks.

In the instance of online auction marketplaces, you could create an escrow system where the seller ships the good to the auctioneer's warehouse (with some practical limitations) who verifies condition and that the good is legitimate (not stolen). Buyers pay money to the escrow company (e.g. Ebay) who ships the goods and send the money to the seller. Any chargebacks go against the escrow company who also happened to have validated the good and can use TOS/Legal Agreements to fight the chargeback on grounds of item quality. In this situation, they could also probably finagle a decent relationship with the CC processors to streamline the process and weed out fraud.

Is that workable? Quite possibly. Is it probable? Probably not.

Edit: Spelling

Shameless plug - trying to help marketplaces with that problem with Credport (https://www.credport.org/).

I really don't know. For example, as MVP they could actually manually verify accounts (verify Facebook login, friends on that account, etc.). Also, at the beginning, maybe to allow only people in same city to do transaction. I know it is hard, but somebody much smarter than me could do it.