The charge back system helped me already several times and this is also why I'm choosing for PayPal.
To be fair, Paypal is now decoupled from ebay, so the rules may be better or worse.
Paypal is good if you are a consumer.
It was good for me for a while on ebay. That was until I sold some bitcoin to the wrong person.
I had more respect for the scammer than paypal. The person who scammed me (supposedly stolen account), had the good grace to leave me positive feedback, which kind of indicates I sent the bitcoin.
The account owner (probably the the real owner and scammer were the same person), put in a claim. A few
months later I lost, my account went into the red because of their charges anyway when they removed the money paid for the bitcoin. Despite evidence that I sent the bitcoin (positive feedback, snapshots of the transaction on blockchain, showing I sent to the address I was given by the buyer, and mails sent to the buyer detailing the transaction number), paypal fucked me over and put me further in the red.
It was obvious I was a victim, but they made me cover the costs. Or rather, they tried, as I refused to pay and have not used their services since.
I think the person who scammed me actually tried to cover me by leaving the positive feedback. Maybe!