I'm curious as to why you would ask such a question. It reminds me of this book that I haven't read but might answer some of your interrogations : http://kk.org/cooltools/archives/11678
There is something special about Islamic culture: From review of linked book: ".....Suppose you wish to send $25,000 from Vancouver, British Columbia, to a friend in Helsinki, Finland. You would hand $25,000 cash to a Vancouver money changer (Hawaladar) in Vancouver, and receive code words (or an agreed signal such as a secret handshake) and a contact address in Helsinki. No actual cash moves out of Canada. Instead,…
This would make it less popular in most of the developed world, with some exceptions, including (possibly) ones in the US. It's the difference between high- and low-context cultures, with the Arab world being generally more high-context than most of the US, with the exception of the South and Texas.
In addition, some subcultures are fairly low-context even if they exist in a generally high-context culture. A "Good Old Boy's Network" is going to be low-context regardless of where it is. https://en.wikipedia.org/wiki/Old_boy_network Exclusive? Yes. Exclusionary? Hell, yeah. Those are the costs of being able to do business on a handshake.
http://en.wikipedia.org/wiki/High_and_low_context_cultures
http://www.marin.edu/buscom/index_files/Page605.htm
http://www2.pacific.edu/sis/culture/pub/Context_Cultures_Hig...
This has more context: