Or use it themselves. They can just print little tailored ads while you're printing based on your print history.
Not too far out of the question the more i think about it. Remember when we used to print directions and they were often littered with ads intermingled with the steps.
>>chrisj+(OP)
I remember business folks throwing out/"recycling" several pages of scam ads faxed to them overnight, every morning. It's not the same thing but it's the same result.