Should I marry an alien for money so he can gain citizenship?

-- Dear Cary,

I am seriously considering offering to marry a man from another country so that he can get his citizenship -- and I can get a lot of money.

Even as I'm typing these words, I know how horrible they sound. But I am not a huge advocate of marriage, am currently single (have had great love in my life), and I need capital to get a business off the ground. I know this is morally reprehensible to a lot of people, but, truthfully, it is an amazing little piece of power that I am holding that could change the lives of two people. I wouldn't marry just anyone -- he would need to be decent and his reasons for wanting to be an American citizen would need to be pure, non-criminal (I know, I know, marrying me would be a crime, but you know what I mean), and of sound mind. --