I can't even begin to understand why becoming an illegal immigrant would seem like a reasonable option for any American. Seriously...even if your life here is completely in the toilet, you've still got more opportunities and a better shot staying in the U.S. than sneaking into some other country where you can't get a real job, can't get any kind of official help if you need it, and have to always be looking over your shoulder. Even if you're doing it to be with your partner, what kind of a start is that to your life together?
I think because some people are under the impression that if you get married, everything magically changes, and you're just fine and dandy.
Now this guy - yeah, he knew what he was doing. But in general, I think many people have incorrect information about stuff like this.
Loads of my friends and family were surprised that I needed to a spouse visa to move/live/work in the UK, and even more surprised to find out that it wasn't even the end of the visa road and there would be more stuff later (like ILR/PC/whatever).
Lots of comments like, "Wait, you're not a UK citizen now that you just married one?"
EDIT: Spelling