A bit more progress made. Turns out that you do not need 30 connections to be able to do targeted adverts. The figure of 30 applies in some other context… But I got 30 eventually anyway.
We are going to have to pay a consultant to take it further though. It is just too complex.
Their conversion rates are reportedly high – around 5%, against google’s < 1%. Accordingly they charge ~£3 per click against google’s £0.50.