Honestly, I think you're lucky. He only lost because he processed multiple high value chargebacks, if that's what they even were. I think they were more than likely disputes, not chargebacks. The reason being is if he marked it as fraud, you lose no matter what. Even if he claimed it was never delivered, if he is even a remotely valued customer at his bank they will take his side on digital goods every single time. Count your blessings and avoid paypal at all costs. Digital currency is the only safe option.