I'm no expert, but this is my observations. It's a very different situation within EU and Europe where the bank account isn't a secret and you can't basically scam anyone when they publish their IBAN (International Bank Account Number). And IBAN transactions are basically free within Europe. Then again, many European countries have strict laws with regards to donations and in my country it's basically forbidden to receive donations without a permit from the authorities (permit is usually time limited and you have to report etc.). So projects that end up receiving most money seems to be located in the US, where donations are permitted, and where PayPal, credit card and similar are more convenient to use. If the US implemented the IBAN system and the banks worked more like in Europe when it comes to money transfer, it would be another matter.