Hi Anna,
I am not going to try and explain how some men think as it seems most of those that have contacted you are not thinking at all. Surely they do not believe that after some small talk and limited dialogue you or any other woman will meet them and introduce them to family and friends. I truly believe these simple minded men are looking down on women from outside there country and assume they are in need of a knight in shining armour to sweep them off their feet.
Sadly i have been contacted by women who demand i visit them or send them money so they can get paperwork prepared for them to visit me so it's a two way street. I do not have the finances to drop evrything and go overseas to meet someone i hardly know and i will definately not send money to anyone. You are being smart and safe for being doubtful and curious.
Take care.