PlentiCash.com claims you can DOUBLE your investment within 48 hours.

According to them in an email i got from them "This system is similar to the popular MMM or Twinkas but it is much reliable and faster. You can get 100% of your investment within 48 hours. For instance, If you invest N100,000 in one member, two other members will pay you N100,000 each making N200,000. If you invest N5,000 in one member, two other members will pay you N5,000 each making N10,000." Are you
in or out?. If you care to find out, here is the link