The way I see it is like this, why would a solo ad vendor want to send his list my offer? Surely if his list was responsive they would send their own offers?
Am I just being cynical here? I'm just thinking that if I had a list that I had built up spent time building a relationship with why the hell would I send them to an offer I know little about? just to earn $50 for 100 clicks? It only makes sense to me if the lists are not that responsive hence them selling clicks rather than products.