hm.. that's very interesting but I haven't heard of anything like that. Let us know if you find anything because I'd be interested. However, if you need help trying to figure out how to monetize your email list, feel free to PM me. I promise I won't try to sell you anything! I've got a pretty good rep on this forum and I enjoy helping out others when I can.
Are you currently monetizing your list in any way? CPA or affiliate offers? Are they targeted emails?