As for scam technique: It's called advanced fee scam I believe.
In advanced fee scams, the scammer tries to persuade the potential victim to offer a sum up front, which is comparatively small to the potential prize (5.6 million).
As for the sales technique: The email swipe is purposefully written like this.
Don't be mislead by the poor English. Many 3rd world nations know English, yet it's common that scams from those places are horribly written.
This is to shave off any email recipients who are too smart to deal with. There's some study about this online.
Bottom line is - if the recipient is dumb enough to notice nothing wrong with the horrendous email, they are also dumb enough to fall for an advanced fee scam.