You might earn some more reward points. But in that process you will loose a lot of other things.
IF SOMETHING GOES WRONG:
You will loose peace of mind, relationship, money, goodwill, tax problems, even your credit card itself may get blocked.
IF EVERYTHING GOES WELL:
You will get those extra rewards, you get extra miles, bonuses, milestone rewards, happiness, and lot more.
If it was me, I won't take chances. I won't invite problems and unknown dangers in my life unnecessarily. Rest is up to you.