+1 - Also keep in mind that you have to give your SSN to open a bank account, retirement plan, credit card, insurance policy, etc. You give pretty specific (and arguably obscure) examples, but honestly your information has already been gone for awhile.
That's a big +1. You're going to eventually get caught anyway, unless of course your spouse isn't really paying attention, which probably means she's cheating on you too.
I will say that I agree with Riff on the spam issue. I get pop-ups all the time asking me to sign up for surveys, and it's hard to know which ones are legit and which ones are malicious. It's not a lot of money for a decent amount of work and risk. Personally I think you'd be better off getting a part-time job (assuming you don't have to watch the kids of course) to make some real money.