I have never heard of anyone who got scammed for a green card not least of which because to get a green card good for 10 years you have to actually stay married at least 2 years. Seems like a very long con.

There are in your own locality as a young person just as many eligible females as their are males. Odds for the woman actually get progressively worse every year as the population of eligible males decreases faster because young men die more frequently and exit the effective marriage pool from her perspective in other ways whether it is because they have non intention of looking for permanent attachment or because they prefer young women regardless of their age.