Yes I think so too. Most likely seller would not experience any loss, but paypal was very interested in this and I had very long conversation..
I am now thinking of best possible way of detecting customers that are behind proxy. Artificial intelligence :) that would warn how quick decision to buy, time spent on site was made to final order for new registered customer.
Now testing maxmind anti fraud. Transactions were market as suspicious because us proxy and billing address has rather big distance.
Might be some kind of timing thing where the chargeback gets credited before the payment is deducted?