Share 'Zine Flyer Swap?'

Was just wondering if anyone ever did this? Send, say, 10 or 20 flyers for your zine to another zinester, who sends you the same number back, and in the next 10 or 20 zines that you send out, you add their flyer to the mailing, and they do the same for you. I know I've received zines with flyers for other zines, but don't know any zine makers personally to swap with.