Unlike the drugs trade, I doubt there are significant numbers of child abusers who are in it for the money. It seems like an incredibly risky business compared to other illegal activities, like drug running. And customer acquisition must be incredibly expensive. Also, as any digital file, a single image can be viewed again and again in the way that 1g of heroine can not. The supply of new images could completely stop and the back catalogue would be enough for customers.

In other words, I don't think this is a market problem so I don't see market solutions having any justification (or indeed effect).