All the other comments were brilliant.

Just a quick point - and please this is not in anyway meant to be offensive.

But Nigeria and for that matter many other countries do have a slight reputation for "scams"

Usually done by zillions of spam emails.

So you might want to really, really build up the credibility of Nigerian Oil.

If it was me, in the copy or even a subhead I might say-

"The best thing about this - it's not a scam...because (and give a big reason why it isn't)"

In other words handle the objection - that many people might have.

Steve