pats,
Here is what happens if you say something like that:
There's usually no paper trail, so IRS agents will typically ask for the names and contact information for people that may have been part of the illegal transaction, Moskowitz says. The agency will then try to verify your numbers with them.
You can't just get through an IRS audit by making up lies.
Here is when a payer is required to pay out a W-2G
By the way, you can read that article and come to a conclusion that in a sense choptalk is right. But they do say that the IRS shares illegal activity information with other law enforcement.