There are all kinds of fraudsters out there but if you are open for applications from real couples, you will get fraudsters too. Same with refugees. For example, look at http://www.cic.gc.ca/english/information/faq/visit/mexicanvisit-faq01.asp Do you think all of the 9400 people who came from Mexico claiming refugee status in 2008 were really refugees? In the end, only 11 percent of them were accepted. You think even all of them were really refugees? I am sure some of them lied about their cases to improve their chances. That's the way it goes. People lie and immigration tries to catch them.