but how dumb this idea is to write "full member" in his signature and pretending
This is because intelligent people have other ways of making money, only those who are unintelligent must resort to scamming.
Not True, Quite the opposite. I work in a world where all big corporations and governments scam the general public because they know they can... who has the most money?
I also think some ways of scamming and getting money out of people are quite ingenious.