I make overseas buyers pay insurance if the sale is over £25, if it's under then I'm prepared to stand the cost if they go missing, because 99% of people are honest. I lost about £300 to two wankers saying they hadn't received the items, both French, so I said never again!
I have also sent people in the UK invoices for records over £100 and they have not chosen the recorded delivery option, which immediately makes me suspicious, so I pay that myself.