And the winner is... The impostor, of course. He is more ingenious than you are, as always.
The trick is, or might be, I have been told, that at a pretty exciting moment of the transaction when your eyes become $so$ wide, you personally are asked to bribe some petty official with a negligible part of your own future winning in this game, and this must be REAL MONEY. You might deduce what happens then...
It has been announced several times in the spring of 2003 (see www.webwereld.nl if you can catch Dutch, and search for "Nigeria") that a group of impostors has been caught and are facing the trial. Still, the letters keep arriving.
An interesting "documented" account of events in the "transaction" is
at www.haxial.com
, a recommended reading!