They charge exactly what the market will bear and not a penny more.
I'm not sure that I agree with Doug in this specific case (although I most certainly do in many cases). Paypal sucks in so many ways but it has been fantastic for small person to person business - selling a single transformer to someone in Germany for example.
The old way was wire transfers, large fees and delays that undermined the viability of small transactions.
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Unless you're in the Eurozone, in which case wire transfers are invariably far better value for both parties. There are competing banks and transfer firms, often offering transfers that are free for the receiver. (I recently used Transferwise for a Japan payment. Note that your bank may try to prevent you using such services on the grounds of 'security' - this is a scandal brewing, as they're trying to make it hard for people to use such services).
I get paid via wire from the USA and I'm told there are quite a few firms offering competitive schemes now. This is in marked contrast to a few years ago, when US clients would insist I took PP.
Paypal is just nasty. Everyone I know has been subject to some kind of charge-back or ripoff scheme by it. They automatically side with the buyer and totally disregard the seller's track record.
Bitcoin has shown what the future holds. Whether it's Bitcoin itself, or a similar P-P scheme, it's only a matter of time before something user-friendly and secure enough emerges. Keep the faith