@axpert,
Not only "judgey" but you also are not up to date with immigration laws.
Nowadays, you only get a "green card" for 2 years. You have to renew it prior to the expiration date and should the marriage not surpass the expiration date of the green card, no new one will be issued.
So, your friend's husband would shoot himself in the foot, if he was out for
immigration papers only.