I edited your last post and took out your email address. This is another way scammers find their victims . . . they surf the net and find email addresses posted on site. On our site, people can always contact you via the "email" button under every one of your posts, so there is never a reason to post your email address.
On to the scammers . . .
Many of them are in Nigeria.
Yes, they steal the photos of people from other sites. They don't want their real face out there, and it is easier to pull of a romance scam if you are a good looking person.
Could they all be the same person? Could be. More likely is that they all work in different "rings". They are all doing the same thing, and each "ring" has it's own letter/story/pictures. There could be 5 guys in the one ring pretending to be Mike Brown. They could all be using the same pictures.
It does not really matter if the pictures or the names match . . . they are all fake.
Another site on this topic you might want to check out ishttp://(Site Not Approved To Post)/
Tell them we sent you there. They know us over here.