There are a number of issues when it comes to investigating this type of crime, and one of them is certainly that they don't have the tools in order to track down who is responsible. A lot of people who carry on their crime over the internet know that this is the case, and they absolutely make the most of the fact that it is very difficult, if not impossible, for them to be found. Of course, if there was a huge amount being done and it looked as though it was the same people responsible then they would take more of an interest, but unfortunately if it's an individual who has only lost a small amount of money, while it might be very upsetting for the victim, chances are the criminals just aren't worth chasing because it would cost so much to do so.