High Yield Investment Programs have a bad name. Rightly so! They are simply ponzi schemes.
But a few are making a healthy living. The BBC says, it's simply a matter of knowing when to cash out.
"It's our belief that there may well be some people making money here," said Dr Richard Clayton, one of the computer security experts behind the study.
"But running one of these scams is certainly far more lucrative than investing in one."