While my friend had quite a rant (on my behalf) about the inadequacy of the Amazon payment system, I used the same logic my tour guide in Rome had used. Amazon is so huge that everybody wants their book on there. So, put simply, they don't need to have a state of the art payment system that has your money hitting your account in a speedy fashion. They know writers and publishers will continue to list their books with them anyway. It's a great gig if you can get it.
Meanwhile I'll wait for my cheques and then a further 30 days while they clear.....and just be happy that I'm part of the Amazon phenomenon. They've completely revolutionalised the way we buy and read books and as a writer that can only be an advantage.