The moral of the story at the link below - Don't Participate In Marriage Fraud.  Even if the U.S. authorities don't find out, your illegal plans for immigration relief may result in some unintended consequences.  In any case, if immigration authorities ever DO find out you received an immigration benefit based on fraud -- you could have the benefit revoked.   So, if you eventually became a U.S. citizen via green card from a fraudulent marriage to a U.S. citizen, you could lose your citizenship.

Death of Pizza Mart Owner Is Tied to Green Card Scam, Witness Tells Police - washingtonpost.com.