I'm trying to increase marketing outreach by inviting people who have larger lists and a related product to let me offer their product as a bonus or an up-sell. Their name on the sales page is a bonus to the product promotion. They benefit by gaining subscribers and, if it's an up-sell, commissions. The added bonus to me is that it's likely they will promote my product to their list.

All theory at this point, I'll let you know how it goes. I've got an upcoming release if any of you are interested.