The site I work for only accepts members from US, Canada, UK, Ireland and Australia. It has to be that way to combat fraud. The non-us traffic for other sites

The site I work for only accepts members from US, Canada, UK, Ireland and Australia. It has to be that way to combat fraud. The non-us traffic for other sites I've built has meant one thing: spam. If there was a way to better filter out fraud and spam from certain countries, I bet one could hit that 25% number easily.