This is an old scam scheme, be like this men done run out of strategies to use perpetrate their illegitimate activities on unsuspecting ignorant Nigerians. It's very disturbing how some set of persons will just seat somewhere and calculate how they can milk the already suffering and struggling Nigerians of their funds that are not even enough to take care of their basic needs by taking advantage of the hunger way day the land to take scam poor Nigerians. Sincerely we are better than this as Nigerians this isn't our culture and norms we're known for.
Absolutely right, people who still use such formats are probably not up to date...some gullible still fall for things like this, this is just like the bank scam fraudsters run, they call you and claim that they are calling from your bank, lol, people still communicate with them ignorantly after being told several times that your bank would never call to ask you for informations they already have... scamming is such a hard work, all those brain work can be put into a legitimate business if they are serious with life... Would Nigeria ever recover from these vices, it seems to be getting worse everyday.
Conversely, it's not only in Nigeria where all these scam activities are found. No society is workout fraudster that's why the government creates an agency to tackle such menace. But something striking which you said is about the effort and hardwork these fraudsters had to put into carryout these scams, it's so trivial of them not to know that if such efforts is exerted into legal areas online it they could be making more money than they think they're doing with scamming people, and in addition to that they also have to live with the fears of not being caught by the authorities. What a life to live.