I can imagine business owners would be interested in the idea of a virtual market around Facebook ads. It would work in a way such that people/traders are betting on reaching a certain conversion value, generated by the predefined ad they invested their money in. The difference between the invested money and the total generated conversion value will be the win/loss of this deal. Assuming the business owner is at least break-even with paying the difference to the conversion rate, if positive, this would boost his business as well.
Thoughts/comments/ideas? :)