It is unfortunate that these few criminals give us all a bad name.
Like Dave I feel sorry for the innocent businesses that are affected, but...
My point is, Nigerians as a whole cannot be seen as scammers because a majority of the 140million nigerians are legitimate.
From a practical standpoint, this doesn't hold true. I'm sure the majority of citizens are legitimate, but the majority of those who will contact a foreign small business owner are not.
I'm sure each and every one of us has received dozens of these sorts of scam letters, but I doubt that even between us we could come up with a handful of legitimate customers.
Its quite easy to deal with this sort of things- ask them to transfer the money to you and have your bank verify first before you ship. EASY.
Personally I don't think it's easy at all. There are many, many ways for scammers to follow through on these frauds if you choose to engage with them, and they often take a significant amount of time to be uncovered. It's just never worth the risk.
It's up to every business owner to make their individual decisions, but personally Nigeria as a whole is blacklisted to me. It's theoretically possible that an individual could convince me to make an exception for them, but it's extremely unlikely. Even if I knew them personally I would probably assume something somewhere would go wrong (like a missing shipment due to corruption - the same reason Italy's postal service can't be trusted).
In my opinion the odds are greater than 1000:1 of any given Nigerian business deal the likes of us would encounter being legitimate. I'm not a betting man, so I just don't think that's worth it - especially when those 1000:1 odds pay out at 2:1.
So yes, sucks to be the legitimate ones who've had your entire country's reputation trashed by its enormous criminal networks and systematically corrupt officials who allow it to happen (because let's face it - it's more than a few bad apples who are ruining it for everyone). But I'll give sympathy, not product.