I used to work as a lounge musician on a cruise ship. As an American worker, I was a minority. . . ( highly paid "American Musician" employee, I might add!)
Made some very good friends with fellow cruise-ship members. . . musicians, entertainers, officers, regular crew-members (the highly underpaid work-horses of the cruise ship, I might add!).
It was not uncommon for non-American employees to actively seek "scam marriages" to obtain their green card. Back then. . . oh , 20 years ago! (Man!! Do I feel old!
). . . the going rate was around $5,000.00.